| A | B |
|---|
| heredity | passing of physical characteristics from parents to offspring |
| genetics | the scientific study of heredity |
| fertilization | a new organism begins to form when egg and sperm join |
| purebred | the offspring of many generations that have the same trait |
| trait | each different form of a characteristic, such as stem height or seed color |
| gene | factors that control a trait |
| alleles | the different forms of a gene |
| dominant allele | an allele whose trait always shows up in the organism when the allele is present |
| recessive allele | an allele that is hidden whenever the dominant allele is present |
| hybrid | an organism that has two different alleles for a trait |
