| A | B |
| heredity | Passing of traits from generation to another |
| alleles | Different forms of the same gene |
| genetics | Study of how alleles affect offspring |
| sex-linked gene | An alleles inherited on a sex chromosome |
| recessive | A trait that is inherited |
| probability | The chance an event will take place |
| genotype | Genetic makeup of an organism |
| homozygous | Organism with two alleles that are the same |
| phenotype | Physical apperance resulting from genotype |
| incomplete dominance | Both alleles are expressed in offspring |
| polygenic inheritance | More than one set of genes controls a trait |
| genome | Chart showing the location of genes on each chromosome |