| A | B |
|---|
| pedigree | record that shows how a trait is inherited over several generations |
| patterns of inheritance | certain phenotypes repeated in predictabel pattern from one generation to the next |
| carriers | individuals who have 1 copy of a ressive autosomal allele |
| genetic disorders | diseases or debilitating conditions that have a genetic basis |
| Huntington's disease | a dominant allele located on an autosome |
| multiple-allele traits | are controlled by three or more alleles of the same gene code |
| polygenic trait | trait that is controlled by 2 or more genes |
| colorblindness | recessive X-linked disorder person cannot distinguish between certain colors |
| hemophillia | recessive X-linked gene impairs the ability of blood to clot |
| trisomy | a zygote with 47 chromosome |
| Down syndrome | a person born with an extra #21 chromosome |
| trisomy-21 | also known as down syndrome |
| genetic screening | examination of a person's genetic makeup |
| amniocentesis | fluid removed from a fetus to detect birth defects |
| single-allele traits | controlled by a single allele of a gene |
