| A | B |
| gene | instructions for an inherited trait |
| allele | different forms of a gene |
| phenotype | organisms outward appearance |
| genotype | combination of letters that represent an organism's genetic makeup |
| Punnett Squares | chart used to organize all possible combinations of offspring |
| homozygous dominant | when the offspring inherits two identical dominant alleles |
| homozygous recessive | when the offspring inherits two identical recessive alleles |
| heterozygous | when the offspring inherits two different alleles |
| probability | the mathematical chance that something will happen |
| trait | characteristic of an organism that makes it unique |
| dominant | the allele that always shows up and hides the weaker allele |
| reccessive | the allelle that is always masked in the presence of the stronger allele |
| heredity | the passing of traits from parent to offspring |