| A | B |
| incomplete dominance | pattern of inheritance in which alleles from both parents are blended |
| codominance | pattern of inheritance in which both alleles of a gene are expressed |
| gender | sex of a person or other organism |
| sex-linked traits | traits that are controlled by the sex chromosomes |
| carrier | organism that has a recessive gene for a trait but does not show the trait |
| pedigree | chart that shows the inheritance of certain traits over several generations |
| inherited disease | disease caused by an inherited gene |
| mutation | change in a gene |
| 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 | mately closely related organisms |
| genetic engineering | methods used to produce new forms of DNA |
| gene splicing | moving a section of DNA from the genes of one organism to the genes of another organism |