| A | B |
|---|
| codominant alleles | phenotypes of both homozygotes are prod. in the heterozygote. |
| completely dominant alleles | phenotypes of both heterozygous & homozygous dom indiv. have same phenotype. |
| incomplete dominance | phenotype of the heterozygote is intermediate between those phenotypes expressed by the homozygotes. |
| carrier | another name for a heterozygous individual. |
| simple recessive heredity | inheritance pattern of phenylketonuria and Tay-Sachs disease. |
| polygenic inheritance | inheritance pattern of a trait controlled by two or more genes. |
| pedigree | a graphic representation of an individuals family tree. |
| autosomes | humans have 22 pairs of these types of chromosomes. |
| sex-linked traits | traits controlled by genes located on the X or Y chromosome. |
| sex chromosomes | the 23rd pair of chromosomes that differ in males and females. |
| multiple alleles | a trait controlled by four alleles is said to have these. |
