| A | B |
|---|
| sex chromosome | determines gender of an individual |
| autosomes | regular body chromosomes, do not determine sex |
| sex-linked trait | gene located on a sex chromosome |
| nondisjunction | a chromosome fails to separate from it's homologue during meiosis |
| pedigree | diagram that shows how a trait is inherited over several generations |
| carrier | heterozygous individual |
| polygenic | trait that is controlled by many genes |
| mulitple alleles | more than two versions of a gene for a trait |
| codominance | two alleles for a trait are expressed in a heterozygous individual |
| incomplete dominance | two alleles blend together in the phenotype of a heterozyguos individual |
| sex-influenced traits | autosomal traits that are influenced by the presence of sex hormones |
| Huntington disease | autosomal dominant condition that develops in mid-life |
| amniocentesis | procedure used in fetal analysis of genetic disorders using amniotic fluid |
| chorionic villi sampling | technique to detect chromosomal abnormalities using chorionic villi |
| genetic counseling | process of informing a person about his genetic makeup |
| gene therapy | technique used to place a healthy copy of a gene into cells carrying a defective gene |
