| A | B |
| Breeding | Producing offspring; raising plants or animals, especially to get new or better kinds |
| Chromosomes | Thread like parts of a cell nucleus made up of DNA and genes |
| Crossbreeding | Combining the sex cells organisms with different traits to create new traits |
| Fertilization | The joining of a sperm cell with an egg cell |
| Gene | A part of a chromosome that controls the development of individual traits |
| Heredity | The passing of traits from parents to offspring |
| Hybrids | The offspring of crossbreeding |
| Mutation | A change in the genetic code of an organism |
| Traits | Characteristics, which may be inherited, that identify organisms as individuals |