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Grade 7 Ch 4 Genetic
Chapter 4 genetics vocabulary
Question | Answer |
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multiple alleles | three or more forms of a gene that code for a single trait |
sex-linked genes | genes on the X or Y chromosome that pass from parent to offspring on a sex chromosome |
carrier | a person who has one recessive allele for a trait and one dominant allele. The person does not have the trait, but can pass the recessive allele on to his/her offspring |
pedigree | a chart or "family tree" that tracks which members of a family have a particular trait |
genetic disorder | an abnormal condition that a person inherits through genes or chromosomes |
cystic fibrosis | a genetic disorder in which the body produces abnormally thick mucus in the lungs and intestines |
sickle cell disease | a genetic disorder that affects the blood; the blood cells have an unusual shape which affects the amount of oxygen in the blood |
hemophilia | a genetic disorder in which a person's blood clots very slowly or not at all |
Down syndrome | a person's cells have a extra copy of chromosome 21 |
amniocentesis | a procedure used to determine whether the baby will have some genetic disorders; a small amount of fluid that surrounds the baby is removed |
karyotype | a picture of all the chromosomes in a cell |
selective breeding | the process of selecting a few organisms with desired traits to serve as parents of the next generation |
inbreeding | involves crossing two individuals that have identical or similar sets of alleles |
hybridization | breeders cross two genetically different individuals to have the best traits from both parents |
clone | an organism that is genetically identical to the organism from which it was produced |
genetic engineering | genes from one organism are transferred into the DNA of another organism; "gene splicing" |
gene therapy | involves inserting working copies of a gene directly into the cells of a person with a genetic disorder |
DNA fingerprinting | using information from a person's DNA for identification |
Human Genome Project | identifies the DNA sequence of every gene in the human genome |
genome | all the DNA in one cell of an organism |