| A | B |
| homozygous | a pair of genes with the same traits |
| heterozygous | a pair of genes with different traits |
| recessive | trait that is hidden by the dominant trait |
| dominant | trait that will hide the recessive trait |
| allele | one member of a gene pair |
| example of homozygous dominant gene pair | RR |
| example of homozygous recessive gene pair | aa |
| incompletely dominant | neither member of the gene pair is dominat |
| Gregor Mendel | discovered genetics by experimenting with Pea Plants |
| true breeders | only one type of trait |
| hybrid | 2 different types of traits |
| genotype | genetic make-up of an organism in symbols |
| phenotype | characteristic that is seen (in words) |
| incomplete dominance | neither allele is is dominant over the other allele |