phenotypes can be lost or altered in ways that were not initially predicted. Creation of inbred mouse strains has also resulted in selection against all recessive lethal alleles and may therefore ...

When two flies that are heterozygous for brown body color and red eyes are crossed (BbEe X BbEe), their alleles can combine to produce offspring with four different phenotypes (Figure 12).

calculations are: two out of four possible combinations create 50% chance for AA, and 50% chance for Aa alleles. There is a ratio of 1:1. Note that all the phenotypes are identical, and will show ...

The height of pea plants is controlled by a single gene which has two alleles: tall and short. The tall allele is dominant and is shown as T. The small allele is recessive and is shown as t.