| A | B |
| example of phenotype ratio of coat color in mice | 75% black; 25% white |
| example of genotype ratio | 100% Bb |
| example of a Homozygous dominant genotype | HH |
| letters representing a hybrid | Hh |
| example of a recessive genotype | bb |
| Tt | example of a heterozygous genotype |
| Genotypes of Mendel's parent peas | TT x tt |
| Phenotype of the F-1's in Mendel's cross with tall and short plants | all Tall |
| type of plants Gregor Mendel crossed | garden peas |
| BB or bb | true breeding genotypes |
| type of pollination giving most variety in offspring | cross |
| genotypes of F-1's crossed to make F-2's | Ff x Ff |
| cross dealing with the genetics of one trait | monohybrid |
| cross dealing with the genetics of two traits at the same time | dihybrid |
| having only one allele of a trait yet trait is expressed | dominant |
| must have two alleles for trait to be expressed | recessive |
| if an organism "breeds true" for a trait | individual is homozygous for trait |