| A | B |
|---|
| traits | characteristics that are inherited from parents |
| heredity | the passage of traits from parents to offspring |
| genetics | the scientific study of heredity |
| purebred | an organism that has two of the same alleles for a trait |
| hybrid | an organism that has a dominant and a recessive allele for a trait |
| genotype | the genes that are present in an organism |
| phenotype | the genes that are expressed in an organism |
| genes | factors that control a trait |
| alleles | different forms of a gene |
| dominant | an allele which, if present, is always expressed |
| recessive | allele which may be masked by the presence of a dominant allele. Shows up only when paired with another recessive. |
