| A | B |
|---|
| controlled breeding | mating organisms to produce offspring with certain traits |
| mass selection | crossing plants with desirable traits |
| Hybridization | mating two different kinds of organisms |
| inbreeding | mating closely related organisms |
| mule | a sterile hybrid between a a donkey and a horse |
| sterile | cannot produce offspring |
| mutation | change in a gene |
| mutagens | factors that increase mutations |
| carcinogens | substances known to cause cancer |
| traits | characteristics of an organism controlled by genes |
