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kwiles C-8
Cell Division
Question | Answer |
---|---|
Tor F: Eukaryotic cells have one strand of circular DNA and no chromosomes | F |
An organism has a diploid number of 20 chromosomes. How many chromosomes would you expect to find in the gametes of that organism? | 10 |
Do gametes undergo mitosis? | no |
How many chromosomes are human beings supposed to have in somatic cells | 46 or 23 pair |
The last pair of chromosomes in a karyotype are called? | sex chromosomes |
Chromosomes other than sex chromosomes are called ? | autosomes |
T or F : Gametes are diploid so that when fertilization occurs the resulting zygote will have the chracteristic number of chromosomes for that species | False: gametes are haploid |
The protein disk that binds to chromosomes together is called a? | centromere |
When DNA in it's uncoiled state inside the nucleus it is referred to as ? | chromatin |
What phase is DNA replicated in ? | Syntheis phase (S phase) of Interphase |
Describe the G1 phase of Interphase? | Immature cells grow and either enter the Go phase or proceed to the S phase |
Chromosomes do not appear in the nucleus until what phase of mitosis? | Prophase |
The cylindrical organelles in cells that produce the mitotic spindle are called? | ,centrioles |
Order the following words from first to last in cell division and mitosis: S phase, M phase, G1 phase, cytokinesis, prophase, telophase, anaphase, metaphase, Interphase. | Interphase, G1, S phase, M phase, prophase, metaphase, anaphase, telophase, cytokinesis. |
The two halfs of chromosomes held together by a centromere are called? | Chromatids |
The desingnation for a diploid number of chromosomes is ? | 2n |
The designation for a haploid number of chromosomes is ? | 1n |
Somatic cells have the diploid or haploid number of chromosomes? | diploid |
How many chromosomes are there in the somatic cells of an organism that has a haploid number of 8? | 16 |
A prokaryotic cell (bacterium) has how many chromosomes? | usually just one- prokaryotes do not have a nucleus and usually only have a single, circular strand of the DNA molecule that serves as a chromosome |
Is interphase part of mitosis? | no |
The stage of mitosis where the chromosomes are lined up on the equator of the cell is? | metaphase |
As a result of mitosis, each daughter cell recieves only half the number of chromosomes in the origional cell? | No- each daughter cell recieves an exact copy of the chromosomes in the origional cell. Mitosis is leads to diploid cells |
The phase of mitosis where the cleavage furrow begins forming is ? | Teleophase |
Metaphase II is part of mitosis? | No- the two(II) indicates meosisII |
Metaphase I is part of mitosis? | No- the (I) indicaties meiosisI |
Prokaryotes divide by mitosis? | no- prokaryotic cells divide by binary fission |
The phase of meiosis where crossing over takes place is? | prophase I |
How many sperm cells are produced from spermatogenesis? | 4 |
How many egg cells are produced from oogenesis? | 1 |
plant cells undergo cytokinesis after the _________ is formed? | cell plate |
If a cell has a 1n number of 3 chromosomes, how many chromosomes will the organisms somatic cells have? | 6 |
Which cells undergo meiosis? | gametes |
The first cell resulting from the fusion of gametes is called? | zygote |
What are the differences between mitosis and meiosis? | Mitosis = nuclear division and meiosis is chromosome reduction in two stages MI and MII. Essentially, meiosis is just like mitosis except for crossing over and synapsis of chromosomes in prophase I. At the end of meiosis I there is two haploid cells and |
Is DNA copied prior to meiosis II? | no- leads to four haploid cells |
What is the difference between homologous pairs of chromosomes and sister chromatids | Homologous pairs of chromosomes include one chromosome from each parent. Sister chromatids are identical copies of DNA held together by a centromere. |
Is DNA copied prior to meiosis I? | yes... leads to two diploid cells . |
What is the difference between homologous pairs of chromosomes and sister chromatids | Homologous pairs of chromosomes include one chromosome from each parent. Sister chromatids are identical copies of DNA held together by a centromere. |
Asexual reproduction involves no transfer of genetic material between different parents T or F | T |
What is the sex of an individual with two X chromosomes for the 23rd pair? | Female |
An individuals karyotype indicated three chromosomes at position 23 XXY. What is the sex of this individual? | male- if a y chromosome is present, the sex is male by definition. |
What organ does spermatogenesis take place in/ | testes |
What organ does oogenesis take place in/ | ovaries |
What is the sex of an individual with two X chromosomes for the 23rd pair? | Female |
An individuals karyotype indicated three chromosomes at position 23 XXY. What is the sex of this individual? | male- if a y chromosome is present, the sex is male by definition. |
Is binary fission asexual or sexual reproduction | asexual |