| A | B |
|---|
| Allele | One of a pair of genes that occupies the same position on homologous chromosomes |
| Autosomal inheritance | Inheritance of a genetic trait not on a sex chromosome |
| Dihybrid cross | A cross between two individuals concentrating on two definable traits |
| Genotype | Two-letter set that represents the alleles an organism possesses for a certain trait |
| Heterozygous genotype | A genotype with two different alleles |
| Homozygous genotype | A genotype in which both alleles are identical |
| Phenotype | The observable expression of an organism's genes |
| Recessive allele | An allele that will not determine the phenotype unless the genotype is hornozygous with that allele |
| True breeding | If an organism has a certain characteristic that is always passed on to all of its offspring, we say that this organism bred true with respect to that characteristic. |
