| A | B |
| genotype | the genes for a particular trait |
| phenotype | the observable trait |
| number of human chromosomes | 46 or 23 pairs |
| recessive | weaker trait hidden in a hybrid |
| dominant | stronger trait visable in a hybrid |
| hybrid | containing a dominant and recessive gene |
| purebred | having matching genes with no hidden traits |
| punnett square | a device used to determine probability in offspring |