| A | B |
|---|
| different forms of a gene | alleles |
| passing of physical characteristics from parents to offspring | heredity |
| both alleles are the same | homozygous |
| study of heredity | genetics |
| allele that is masked when another allele is present | recessive |
| factors that control traits | genes |
| any change in a gene or chromosome | mutation |
| made up of many genes joined together | chromosomes |
| an organism's physical appearance | phenotype |
| an allele whose trait always shows up when that allele is present | dominant |
| two different alleles for a trait | hybrid |
| a chart that shows all possible combinations of alleles | Punnet square |
| the offspring of many generations that have the same traits | purebred |
