| A | B |
| gene | sequence of DNA that codes for a protein and thus determines a trait; factor that is passed from parent to offspring |
| allele | one of a number of different forms of a gene |
| homozygous | having 2 identical alleles for a particular gene |
| heterozygous | having 2 different alleles for a particular gene |
| multiple allele | a gene that has more than 2 alleles |
| homologous | chromosones in which one set comes from the male parent and one set comes from the female parent |
| meiosis | process in which the number of chromosones per cell is cut in half through the separation of homologous chromosones in a diploid cell |
| zygote | fertilized egg |