| A | B |
|---|
| trait | a characteristic that an organism can pass on to its offspring |
| heredity | the passing of traits from parents to offspring |
| genetics | the scientific study of heredity |
| purebred | an organism that always produces offspring with the same form of a trait as the parent |
| gene | a segment of DNA on a chromosome that codes for a specific trait |
| allele | the different forms of a gene |
| dominant allele | an allele whose trait always shows up in the organism |
| recessive allele | an allele that is masked when a dominant allele is present |
| hybrid | an organism that has two different alleles for a trait |
| heterozygous | for a particular trait |
