| A | B |
| allele | Half of a genotype or a trait from one parent |
| phenotype | The outward expression of a trait |
| dominant | A trait the appears in the parent generation and offspring |
| polygenic inheritance | Height, eye color, and skin color are examples of these |
| genetics | A branch of biology that deals with heredity |
| genotype | The actual combination of genes represented by letters |
| Genetic Engineering | Moving fragments of DNA from one organism to another |
| Punnett Square | A helpful device for predicting results of offspring |
| heredity | The passing of traits from parent to offspring |
| sex-linked gene | Color blindness and hemophilia are examples of this |
| incomplete dominance | Where neither trait is expressed or hidden |
| heterozygous | An organism that has two different alleles for the same trait |
| homozygous | An organism that has the same alleles for the same trait |
| hybrid | An organism that a heterozygous genotype |
| pedigree | A tool the is used to understand inheritance over generations |