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2010 ECA 3rd hour
ECA review 3rd hour
Question | Answer |
---|---|
What is a small section of chromosome that determines a specific trait of an organism? | Gene |
What is the study of how traits are passed from parents to offspring? | Genetics |
Genes that keep other genes from showing their traits are? | Dominant Genes |
An organism with two dominant genes for a trait is? | Pure Dominant |
What is the name for the genes that do not show when dominant genes are present? | Recessive Genes |
An organism with two recessive genes for a trait is said to be? | Pure Recessive |
What is it called when an individual carries a dominant and a recessive gene for a trait? | Heterozygous |
What is a way to draw out which genes can combine when egg and sperm join? | Punnett Square |
Who was an Austrian who saw certain traits in the garden pea plants he grew? | Gregor Mendel |
What is the large round part in the center of the cell? | Nucleus |
What two types of cells can a sex cell be? | Egg Cell and a Sperm Cell |
Draw a Punnett Square using Aa for the father and aa for the mother. | a a A Aa Aa a aa aa |
What cells are responsible for passing traits from one generation to the next? | Sex Cells |
How many different kinds of body cells do we have? | 200 |
How many chromosomes do sex cells have? | One of each kind- half as many as bod y cells |
How are traits passed from their parents to their offspring? | Genes |
In a Punnett Square what does the capital letter stand for? | The Dominant Gene |
In a Punnett Square, what does the lower case letter stand for? | The Recessive Gene |
What method did Mendel use when experimenting with his pea plant? | The Scientific Method |
In a punnett square what would a heterozygous individual show? | Uppercase letter, lower case letter – Aa |
What different traits did Mendel study in his pea plants? | color of peapod; shape of pea; color of pea; color of flowers |
Observed results of genetic traits can be? | seen |
Genes are found in which part of the cell? | chromosomes |
Which cell part is the smallest? | the gene |
Each body cell has how many genes for each trait? | two |
How many chromosomes should a human body cell have? | 46 |
What do the letters outside the punnett square stand for? | genes in eggs and sperm |
What do the letters inside the punnett square stand for? | the genes in offspring |
A person is having two genes that are alike is…? | pure |
Long rod-shaped bodies inside a cell’s nucleus are called? | chromosomes |
What is a group of living things of the same species? | Population |
The movement of animals out of an area is called? | Emigration |
What is a movement of animals in to an area called? | Immigration |
Any condition that keeps the size of a population from increasing is called? | limiting factors |
What are two ways to count a population? | Tagging, leg bands, radio transmitters, painting trees, or ribbons |
What is an advantage of a species staying in a group? | finding/hunting food together, protection |
What is the struggle among organisms to get their needs for life? | competition |
What are two examples of groups of animals? | herds, packs, flocks, clumps |
All the living things in an area that depend upon each other is a? | community |
What is a place where a plant or animal lives? | habitat |
What is a job of the organism in the community? | niche |
Animals that eat only plants are? | primary consumers |
What are animals that eat other animals? | secondary consumers |
What are living things that get their food from breaking down dead matter? | decomposers |
What are 3 groups niches can be divided into? | producers, consumers, decomposers |
What are organisms that make food in a community? | producers |
Organisms that eat other organisms are? | consumers |
What is a pathway of energy and materials through a community? | food chain |
Food chains connected in a community are? | food web |
What is a diagram that shows energy loss in the food chain? | energy pyramid |
What is the first group in a food chain? | producers |
The second group in a food chain is? | consumers |
What are the last two groups in the food chain? | secondary consumers, decomposers |
What do organisms get energy from? | food |
How do producers make food? | use light |
Most energy is lost as? | heat |
Where is the most available energy found on the energy pyramid? | bottom, producers |
What is a relationship in which two organisms benefit from each other? | mutualism |
A relationship in which two organism live in a community and one benefits while the other is not harmed is? | commensalism |
What is a relationship between two organisms in which one is helped and the other is harmed? | parasitism |
What is a predator – prey relationship called? | predation |
An animal that hunts, kills, and eats another animal is called what? | predator |
What is an animal that the predator kills and eats called? | prey |
What is an organisms called that a parasite lives on? | host |
Name two types of parasites. | ring worm, tape worm, ticks, fleas head lice, body lice, bacteria |
What is a community interacting with the environment? | ecosystem |
What is the study of how living things interact with each other and with their environment? | ecology |
What is the reusing of nitrogen in an ecosystem? | nitrogen cycle |
What is the path that water takes through an ecosystem? | water cycle |
What are the changes that take place in a community as it gets older? | succession |
What is the last stage of succession in a community? | Climax community |
What is the name of the water in the air that falls to the earth as rain or snow? | precipitation |
The average light, temperature, and precipitation in an area taken over many years is called? | climate |
What is a land area with a distinct climate and with specific types of plants and animals? | biome |
Which biome has cacti and small bushes? | desert |
What is biome has tree frogs, birds, and monkeys? | tropical rainforest |
What is the Earth’s largest ecosystem? | ocean system |
Water ecosystems are divided into what 2 categories? | fresh water and salt water |
In the later stages of an older pond, what animals are usually found in it? | turtles and frogs |
What is the first step in Land Succession? | bare soil, and after a few weeks or months, weeds |
Which biome has polar bears and caribou? | tundra |
What are most plants categorized as? | producers |
What has its own distinct producers, consumers, and decomposers? | biome |
Which communities go through succession? | all communities |
If a community is not disturbed, what begins to form? | a forest |
Producers, consumers, and decomposers make up what part of an ecosystem? | living |
Soil, air, water, light, and temperature determine what about an organism? | where it can live |
Air is made up of what 3 gases? | oxygen, nitrogen, and carbon dioxide |
What is necessary for photosynthesis to take place? | air, light, water, carbon dioxide, and chlorophyll |
Plants use what from the sun to make food? | light |
Producers transfer what to other living things through food chains? | energy |
______ and _______ are related to each other? | light and temperature |
Temperature and light are factors in the ________ cycle? | water |
What does your immune do for your body? | keeps it free from disease |
What system fights off disease? | immune system |
Chemicals that help destroy bacteria or viruses are called ____? | antibodies |
Foreign substances, usually proteins that invade the body and cause disease are called___? | antigens |
Since the immune system has a memory how long will the white blood cells produce antibodies? | months or years |
The ability of a person who once had a disease to be protected from getting the same disease again is called the ___? | immunity |
What kind of disease is AIDS? | Immune system |
How is AIDS caused? | virus that reproduces only inside one kind of white blood cells |
A measuring system based on units of 10 is called ___. ? | International system of Units |
What is the length? | distance from one point to another |
The amount of space a substance occupies is called ___? | volume |
How is mass measured? | comparing an object of unknown mass to an object of known mass |
What does it mean to group things based on similarities? | Classify |
What is a feature that something has? | Trait |
What is the largest classification group of all living things? | Kingdom |
What is the largest group within the classification of a kingdom? | Phylum |
What is the largest group within the classification of a phylum? | Class |
What is the largest group within the classification of a class? | Order |
What is the largest group within the classification of an order? | Family |
What is the largest group within the classification of a family? | Genus |
What is the smallest classification group of living things? | Species |
What is the genus and species name together called? | Scientific name |
In one of the five kingdoms what is a one celled organism that doesn’t have a nucleus? | Moneran |
In one of five kingdoms what is the mostly single celled organism that has nucleus and other cell parts? | Protist |
In one of the five kingdoms what is an organism that has cell wall and absorbs food from their surroundings? | Fungi |
What is an organism that is made up of many cells that has chlorophyll and can make their own food? | Plant |
What is an organism that has many cells, cannot make their own food, and can move? | Animal |
Who was one of the first people to classify living things into two groups? | Aristotle |
Who placed living things into two main kingdoms? | Linnaeus |
What names are commonly used in everyday language for animal species? | Common |
What types of scientist have a system for grouping living things? | Biologist |
Why do we classify everyday things? | To make easier, shows certain traits, and puts organisms in order |
What are the three different groups that Aristotle classified animals in? | Land, air, water |
What class is always written first in a scientific name? | Genus |
Put the classification system in order. | Kingdom, phylum, class, order, family, genus, and species |
What is the kingdom name to which a house cat belongs? | Animal |
What do lions, deer, and octopi have in common that a tree doesn’t? | All animals |
What makes up a scientific name? | Genus and species |
Why is the horseshoe crab classified with spider? | Body chemistry |
What is a horse more related to? | Donkey |
What type of bacteria lives in unusual places on Earth? | Archaea |
What are single celled, have a nucleus, have chlorophyll, and take food from surroundings? | Protist |
What is a one celled organism, no nucleus, lacks most cell parts, and only has two phyla? | Moneran |
What has chlorophyll, can make their own food, and cannot move? | Plant |
What kingdom has all consumers? | Animal |
A monerean has only two phyla. What are they? | Bacteria and blue-green bacteria |
Which two scientist both grouped plants and animals as classification groups? | Linnaeus and Aristotle |
Which scientist grouped plant and animals into two kingdoms? | Linnaeus |
How is a house number on a street compared to the classification group species? | Both the smallest groups |
How many classification groups are there? | Seven |
How are prokaryotic and eukaryotic cells different? | Prokaryotic cells do not have a nucleus. In eukaryotic cells, the nucleus separates the DNA from the rest of the cell. |
Cells that enclose their DNA in nuclei are called ___________. | eukaryotic cells |
Cells that do not have nuclei are called _____________. | prokaryotic cells |
Where is the DNA in prokaryotic cells? | floats freely in the cell |
What are the activities that prokaryotic cells do? | grow, reproduce, respond to the environment, and glide along surfaces or swim through liquids |
The living things that we call bacteria are _____________. | prokaryotes |
How many structures and membranes are inside eukaryotic cells? | dozens |
How is a bacterium easily destroyed? | antigens and antibodies on the surface of a white cell fit together correctly |
How can your immune systems memory be refreshed? | by getting shots |
What does AIDS stand for? | Acquired Immune Deficiency Syndrome |
Is there a cure for AIDS? | no |
Who uses this type of measurement? | scientists |
What is the SI unit of length? | meter |
What is the SI unit of volume? | cubic meter |
What is the instrument used to measure mass? | balance |
Put the SI units in order from least to greatest? | milli, centi, deci, (base) deka, hector, kilo |
Dimples are ______ | dominate trait |
Freckles are ______ | dominate trait |
Curly hair _____ | dominate trait |
Straight hair ______ | recessive trait |
Without dimples ______ | recessive trait |
Attached ear lobes ______ | recessive trait |
Short eyelashes _______ | recessive trait |
A case in which neither gene is totally dominate to the other | incomplete dominance |
A genetic disorder in which all the red blood cells are shaped like sickles | sickle-cell anemia |
Each human had 23 ____ & _____ | egg and sperm |
Each human body cell had 23 pairs which is ______ in each human body cell | 46 chromosomes |
Different organisms have different ____ of chromosomes | number |
_____ Cells have 23 chromosomes not paired | sex |
______ Cells have 46 chromosomes arranged in 23 pairs | body |
In humans a special pair of chromosomes determines the _____ | sex |
The four different blood types are | A, B, AB, O |
Females have two genes for each _____ because females have 2x chromosomes | trait |
What is the way of looking at the chromosomes of a fetus? | amniocentesis |
What is the sex chromosome of a female called? | X-chromosome |
What is the sex chromosome called that is only found in males? | Y-chromosome |
What are the chromosomes that do not determined the sex of a person called? | autosomes |
What is the disorder in which red and green look like shades of grey or other colors? | color blindness |
What is a genetic disorder that is also called word blindness? | dyslexia |
What is the use of genetics to predict and explain traits in children? | Genetic counseling |
What is the diagram that can show how a certain trait is passed along in a family? | Pedigree |
What is a way of looking at the chromosomes of a fetus? | amniocentesis |
What chromosome is the gene for color vision on? | X only |
What are the sex chromosomes for a human male? | Xy |
A mistake in chromosome number can occur during _____ | meiosis |
What is a genetic disorder that harms brain cells? | PKU |
It is possible for a female to have what kind of color blindness? | Red-green |
In cows, red hair shows incomplete dominance over white hair. A cow, heterozygous for the trait of hair color would have _____ hair | mixed red and white |
Cell reproduction in which two identical cells are made from one cell? | Mitosis |
Cells that make up most of the body, such as the skin, blood, bones, and stomach? | Body cells |
The two strands of a chromosome after it becomes doubles? | Sister chromatids |
Reproductive cells produced in sex organs? | Sex cells |
A kind of cell reproduction that forms eggs and sperm? | Meiosis |
The stage in life when a person begins to develop sex cells? | Puberty |
Male sex organs that produce sperm? | Testes |
The female sex organs? | Ovaries |
Small cell formed during meiosis in a female? | Polar body |
Disease in which the body cells reproduce at an abnormally fast rate? | Cancer |
What forms all body cells? | Mitosis |
When does mitosis begin? | before you are born |
When does mitosis end? | when you die |
Name some of the parts of an animal cell? | Nucleus, chromosomes, cytoplasm, centrioles, nuclear membrane, cell membrane |
What surrounds an animal cell? | cell membrane |
What is most of the material inside an animal cell? | cytoplasm |
What surrounds the nucleus? | nuclear membrane |
In the first step of mitosis what doubles? | chromosomes |
What is the exact copy of the original chromosome? | Chromatid |
What doubles before mitosis begins? | centrioles |
What begins to shorten and thicken during mitosis in the first part of step 1? | Sister chromatids |
What begins to break down during step 1 of Mitosis? | nuclear membrane |
What moves away from each other during step 1 of mitosis? | centrioles |
What forms between the centrioles in step 1 of Mitosis? | fibers |
What are the fibers made of? | Strands of protein |
In step 2 of Mitosis what moves to opposite ends of the cell? | centrioles |
What attaches to the fibers in step 2 of Mitosis? | sister chromatids |
What gets pulled toward the center of the cell in step 2 of Mitosis? | sister chromatids |
At the end of step 2 in Mitosis what is lined up a crossed the cell? | sister chromatids |
At the beginning of step 3 in Mitosis what is pulled apart by the fibers? | sister chromatids |
In step 3 of Mitosis what is being pulled toward the centrioles? | sister chromatids |
In step 4 of Mitosis what begins to disappear? | fibers |
In step 4 of Mitosis what begins to reform? | nuclear membrane |
The cell membrane begins to pinch in until what is divided in half? | cytoplasm |
At the end of step 4 of Mitosis what has been formed? | 2 new cells |
What do the 2 new cells have the same of? | chromosomes and number of chromosomes |
What are the benefits of Mitosis? | Mitosis helps us grow by producing new cells, replaces cells lost through cell and death and injury |
Sperm are sex cells made by the? | male |
An egg is a sex cell made by the? | female |
During meiosis the four chromosomes make up what? | two matching pairs |
During meiosis a cell divides how many times? | twice |
The first time a cell divides, each chromosome in a pair moves away from its? | partner |
Each chromosome of a pair goes to a different? | cell |
The sister chromatids stay joined together and then two cells do what? | divide again |
How many chromosomes are in each of the four final cells? | two |
The number of chromosomes in each cell is what the original number? | ½ |
The original cell started with how many chormosomes? | four |
Each new cell now has only how many chromosomes? | two |
In step one of meiosis the sister chromatids shorten and do what? | thicken |
In step two of meiosis the nuclear membrane begins to? | break down |
The centrioles begin to move away from one another and form what? | fibers |
The matching chromosomes now come together to form? | pairs |
The centrioiles have moved to what end of the cell? | opposite |
The sister chromatids come attached to the? | fibers |
Fibers move the two pairs of matching chromosomes to the what of the cell? | center |
Fibers move the matching chromosomes what? | apart |
The cell membrane begins to pinch the cell into two and divides the cytoplasm in? | half |
Two new cells have now? | formed |
The centrioles _____ and fibers form again? | double |
A new nuclear membrane _____ form at this time? | doesn’t |
The centrioles move apart, and the fibers are formed ____ them? | between |
The fibers connect to the sister chromatids at the point where the chromatids are? | joined together |
The sister chromatids are pulled to the ___ of the each cell? | center |
The fibers pull each ____ of the sister chromatids apart and to opposite ends of the cell? | strand |
Each sister chromatid is an ____ copy of just one of the original chromosomes? | exact |
The nuclear membrane begins to reform around each new set of? | chromosomes |
Cell membranes begin to pinch each cell in two along the? | center |
Sperm and what are formed during meiosis? | egg |
Sperm and egg have how much the number of chromosomes found in the body cells? | half |
Sperm and egg both begin to develop by meiosis at what? | puberty |
What is the stage in life when a person begins to develop sex cells? | puberty |
Are eggs larger or smaller than sperm? | larger |
Each sperm has a what? | tail |
The sperms tell helps it to do what? | move |
Sperm forms in the what? | testes |
Testes are the male sex organs that produce what? | sperm |
Eggs are formed in the what? | ovaries |
Ovaries are the what sex organs? | female |
Meiosis in males occurs all the time from the beginning of what? | puberty |
What is a small cell formed during meiosis in a female? | polar body |
The polar body divides and does what? | dies |
The large cell that remains forms another what when the cell pinches in half again? | polar body |
The third polar body also does what? | dies |
The large cell that remains becomes the what? | egg |
What is formed once a month from the onset of puberty? | egg |
When sperm and egg join the chromosomes from each cell also do what? | come together |
The new organism has a complete set of chromosomes in each of its what? | body cells |
How much of the chromosomes in the organism come from the father? | half |
What are two differences in plant and animal mitosis? | plants cells lack centrioles and at the end of cell division a cell wall is laid down |
What is the process of becoming older? | aging |
What are some signs of aging in humans? | loss of hair, wrinkled skin, and loss of calcium in bones |
What have regular rates of reproducing? | healthy cells |
What undergoes mitosis every twenty days? | skin cells |
What may undergo mitosis once every two hundred days? | liver cell |
What increases the number of cells? | rapid mitosis |
What parts of the cell change during rapid mitosis? | shape and nuclei |
What are three known causes of cancer? | chemicals, radiation, viruses |
What may happen to the cells if they are in contact with poisonous chemicals for a long time? | they might become cancer cells |
If a person spends to much time in the sun? | the person may get skin cancer |
Why is it so difficult to cure cancer? | so many causes of cancer are unknown |
Give an example of how a new species could form… | 1) A barrier forms 2) Living in different environments 3) Show different traits |
Animals that can become trapped in frozen ice or mud, and insects can get trapped in sap are considered to be what? | Fossils |
Name one effect of mutations. | 1) They could lead to a formation of a new species 2) An animal could become less adapted to its environment 3) An animal or insect could die because it cannot survive in its environment |
How would being a white deer help you survive in the winter? | Your fur color helps you blend in with the snow. |
Living things overproduce…what does it mean? | living things create more offspring than survive. |
How are vestigial structures evidence of evolution? | some animals have them and need them but we do not therefore… evolution. |
One flower opens during the day and one opens at night, which one is more likely to be pollenated by a moth? | the one open at night |
Give four examples of evolution. | 1) Changes in fossils 2) Similarities in embryos 3) gene code 4) vestigial structures |
Name one vestigial structure in the human body. | 1) Remains of third eyelid, appendix, etc. |
How are fish, frog, turtle, bird, and rabbit embryos similar? | They have spines, tails, ears etc. |
Two robins fighting over a worm is an example of what? | competition |
True or false, a change in climate may bring about a new species? | True |
Which layer of sedimentary rock has the most complex life forms? | the top layer |
What are mammals with eyes that face forward, well developed cerebrum, and thumbs that can be used for grasping? | Primates |
What mammals have a tail that can grasp like a hand and nostrils that open upward? | New-world monkeys |
What mammals cannot grasp with their tails, if they have one, and nostrils that open downward? | Old-world monkeys |
What are traits that help living things survive in their environment? | Adaptations |
The theory that living things over produce, that there is a variations among offspring, there is a struggle to survive, and natural selections is always taking place was developed by whom? | Charles Darwin |
What is the change in hereditary features among animals in the same species over time? | Evolution |
A trait that makes an individual different from other species is? | Variation |
The struggle among living things to get their needs for life is? | Competition |
What are the remains of once living things? | Fossils |
Rocks that form from layers of mud, sand, and other particles are called ___________ _____? | Sedimentary rocks |
What is the process in living things surroundings that determines if it will or will not survive and reproduce? | Natural selection |
A group of living things that can breed with others of the same kind and produce fertile offspring are called what? | A species |
Being able to reproduce by forming egg and sperm cells is what? | Fertile |
What are body parts that no longer have a function are called _________ __________? | Vestigial structures |
In a place with dark soil, which mouse will be better able to survive, the light mouse or the dark mouse? | Dark mouse |
Where is the oldest layer of rock with the oldest fossils found? | Bottom because it was formed first |
Changes in fossils, similarities among embryos, gene code, and vestigial structures are all evidence of what? | Evolution |
Smoke and fog combined | smog |
Means poisonous | toxic |
Molecule made of three oxygen atoms | ozone |
Chemicals used to kill unwanted pests | pesticides |
Something that can be broke down by microbes into harmless chemicals | biodegradable |
Rain that has a ph. Level between 1 and 5.5 | acid rain |
Toxic wastes made when paints and inks are made | pcbs |
Chemical sprays used to kill insects | ddt |
Trapped heat that may cause temperatures to rise slowly | greenhouse effect |
A very bad problem related to pollution | acid rain |
A species in danger of becoming extinct | endangered |
A species close to being endangered | threatened |
Wearing a way of soil | erosion |
Material that settles at the bottoms of the streams | sediment |
Making surrounding unhealthy and dirty | pollution |
Remains of creatures that lived long ago, and remains are used for energy | fossil fuel |
How much of the earth is covered in water | 70% |
When soil dries up it | erodes |
Any part of the earth used by human | natural resources |
All living things use for respiration | oxygen |
What do power plants put into the air | sulfur |
What can kill insects without hurting other creatures | bacteria |
What’s the process of reusing things | recycle |
What are the three R’s | reduce, reuse, and recycle |
How many trees are saved if we recycle the Sunday paper | 500,000 |
What is it called when you form and offspring similar to the parents? | Reproduction |
What do you call all of the changes as the living thing grows? | Development |
What is the basic unit for all living things? | Cell |
What is the process by which food is broken down and energy is released? | Cellular Respiration |
What is a living thing that makes or produces its own food? | Producer |
What is a living thing that consumes other living things? | Consumer |
What is a trait that makes living things better able to survive? | Adaptation |
Who is the scientist that looked at thin slices of cork under a microscope? | Robert Hooke |
What is the thing that gives the cell its shape? | Cell Membrane |
What controls most of the cells activities? | Nucleus |
What surrounds he nucleus and separates it from the rest of the cell? | Nuclear Membrane |
What is the cell part that helps ribosomes? | Nucleolus |
What is the cell part that determines what traits a living thing will have? | Chromosome |
What is the clear jellylike material between the cell membrane and the nucleus that helps make up most of the cell? | Cytoplasm |
What cell part moves materials within the cell? | Canal Network |
What cell part produces energy? | Mitochondria |
Which cell part makes proteins? | Ribosomes |
What is the cell part that stores food, water, and minerals? | Vacuole |
This cell part helps with ell reproduction. | Centrioles |
A cell wall is found in which cell plant or animal? | Plant |
Chloroplast is found in which cell plant or animal? | Plant |
Moving a substance from where there was a large amount to a smaller amount is called? | Diffusion |
Membranes have opening called? | Spores |
Movement of water across the cell is called? | Osmosis |
What do you call a group of similar cells working together to do a certain job? | Tissue |
A group of organs working together to do a job is? | Organ System |
What is a living thing called? | Organism |
This cell part destroys worn out parts and gets rid of bacteria? | Digestive Sacs |
This cell part packages and stores chemical? | Packaging Structures |
What are two cell parts found in plant cells that are not found in animal cells? | Chloroplast and cell wall |
A molecule that makes up genes and decides the traits of all living thing. | DNA |
What forms the rungs of a DNA molecule? | Nitrogen bases |
What is the chemical that acts as a messenger for DNA? | RNA |
What code translates the DNA language into the protein language? | Genetic code |
Any change in coping the DNA message | Mutation |
Energy that is given off by atoms is what? | Radiation |
What are two children called that can form from the splitting of one fertilized egg? | identical twins |
Twins that form from two different fertilized eggs are called what? | Fraternal |
What do scientists compare DNA to? | a twisted ladder |
Base A joins with base what? | base T |
Base C joins with base what? | base G |
A chemical within each of your body cells that controls life is called what? | genes |
What does DNA stand for? | deoxyribonucleic acid |
All living things contain what in their cells? | DNA |
Scientists have estimated that a single DNA molecule in a human cell contain about how many rungs? | 100 million |
What controls traits? | DNA |
A chemical that acts as a messenger for DNA is called what? | RNA |
What does RNA stand for? | ribonucleic acid |
The DNA message will change if what takes place? | mutation |
Mistakes in what can cause mutations? | copying |
What type of twins are clones? | identical twins |
Clones have the same what? | DNA and traits |
Fraternal twins have different what? | DNA |
Selective breeding has produced new and better types of plants and what? | animals |
A serious blood disease that starts from a mutation. | hemophilia |
The bringing together of two living things to produce offspring is what? | breeding |
What is the main reason why people breed animals? | to make better offspring |
How many steps are used when DNA copies itself? | 4 |
What is sunscreen helpful for? | it helps protect the skin from the suns radiation |
What does gene splicing produce that makes certain chemicals? | bacteria |