| A | B |
|---|
| hybrid | another name for heterozygous; has a capital letter and a small letter |
| heterozygous | another term for hybrid; Xx; has two different alleles for a trait |
| allele | an alternate form of a gene |
| homozygous | having the same allele for a particular trait; TT or tt are examples |
| gene | segment of DNA that codes for a particular trait or protein |
| F2 | second filial generation; the "grandchildren" |
| F1 | first filial generation; the "children" |
| P | parental generation |
| dominant | the allele that is expressed most often |
| pure | another name for homozygous; contains the same allele for a trait; TT or tt |
| recessive | describes a trait that is "hidden" by the dominant gene; seen in the F2 |
| test cross | used to determine the genotype of an unknown individual; cross the individual with a homozygous recessive individual |
| punnett square | diagram used to predict the genotypes of offspring |
| genotype | expressed as DD, Dd or dd; the actual genes of the organism |
| phenotype | the appearance of the trait in an individual; ex: curly hair or blue eyes |
