| A | B |
|---|
| acquired trait | a trait influenced by experience or the environment |
| carrier | is one who has inherited the gene for a particular trait but does not show that trait |
| chromosome | threadlike structures in the nucleus that contain directions for cell activities |
| dominate trait | the form of an inherited trait that masks the other form of the same trait |
| gene | portion of a chromosome that controls a particular inherited trait |
| genetic disorder | condition caused by mutations, or changes, in a gene or a set of genes |
| genetics | the study of heredity |
| genotype | all the genes that are inherited by an organism |
| heredity | the passing of inherited traits from parents to offspring |
| hybrid | an organism produced by the crossing of parents that have two different forms of the same trait |
| inherited trait | characteristics passed from parent to offspring |
| pedigree | a chart that traces the history of a trait within a particular family |
| phenotype | the way in which a genotype is expressed, shown, in an organism |
| recessive trait | the hidden form of an inherited trait which only show in the phenotype if it is paired with another recessive trait |
| x chromosome | female |
| y chromosome | male |
| purebred | organisms that always produce offspring with the same traits |
| Punnett squares | predict the possible outcomes of genetic crosses |
| probability | the likelihood of an event |
| selective breeding | mating certain organisms in order to promote offspring with desirable traits |
| breed | members of a group with similar traits |
| hemophilia | a disorder where blood does not clot properly |
