| A | B |
| Incomplete Dominance | A case of contrasting alleles in which one allele is only partially dominant over the other; also known as the blending inheritance |
| Dominant Trait | The trait or allele that is expressed |
| Recessive Trait | The trait or allele that is present but that is not expressed |
| Progeny | Offspring |
| Siblings | Brothers or sisters |
| Punnett Square | Used to represent genetic crosses |
| Genotype | The genetic makeup of an organism |
| Phenotype | The appearance of an organism |
| Segregation | Separation of genes |
| Recombination | Mixing and recombining of genes |
| Codominance | A case of contrasting alleles in which neither allele is dominant over the other, so both traits are visible |
| Gene linkage | When genes for two different traits are located on the same chromosome pair |
| Crossing over | During synapsis, chromatids of chromosomes often twist around each other, break, exchange segments and then rejoin |
| Variability | The amount by which individuals in a population differ from one another due to their genes, rather than their environment |