| A | B |
| P Generation | The parent generation of offspring |
| Monohybrid | Punnett Square that focuses on only one gene |
| Multiple Allele Gene | Inheritance pattern; the genotypes have more than two potential alleles |
| Zygote | Fertilized cell that forms when two gametes combine |
| Homozygous | When both copies of a gene are identical |
| Gametes | Male and female sex cells of organisms |
| Recessive | The allele that gets masked by the dominant allele |
| Sperm | Male gametes for humans |
| Incomplete Dominance | Inheritance pattern; heterozygote phenotypes show a blending of traits |
| Crossing | Mating a male and a female organism together to produce offspring |
| Genotype | The two copies of genes an organism receives from their parents |
| Polygenic Inheritance | Inheritance pattern; A trait that is coded by more than one gene |
| Eggs | Female gametes for humans |
| Mendelian Gene | Inheritance pattern; A gene that codes by simple, original genetic rules |
| Chromosome | A section of highly coiled DNA containing genes |
| Phenotype | The trait that appears in an organism, based on its genotype |
| Genetics | The study of heredity, or passing traits to offspring |
| Codominance | Inheritance pattern; heterozygote phenotypes show both traits at once |
| Dominant | The allele that will appear in the phenotype if present in the genotype |
| Dihybrid | Punnett Square that focuses on two genes at a time |
| F1 Generation | The first offspring generation of offspring |
| Heterozygous | When the two copies of a gene are different |
| Sex-Linked Trait | A gene or trait found on one of the sex-chromosomes |