| A | B |
|---|
| dominant | One of a pair of alternative alleles that masks the effect of the other when both are present in the same cell or organism. |
| recessive | One of a pair of alternative alleles whose effect is masked by the activity of the second when both are present in the same cell or organism. |
| Punnett Square | A grid that can indicate all the possible outcomes of a genetic cross. |
| purebred | An organism that always produces offspring with the same form of a trait as a parent. |
| hybrid | An organism that has two different alleles for a trait. |
| heterozygous | Having two different alleles for a trait. |
| homozygous | Having two identical alleles for a trait. |
| genotype | An organism's genetic makeup, or allele combination. |
| phenotype | An organism's physical appearance, or visible traits. |
| codominance | A condition in which neither of the two alleles of a gene is dominant or recessive. |
