Understanding Dominant/Recessive Practice Test

Black fur (A) is dominant to brown fur (a) and brown eyes (B) are dominant to blue eyes (b) in mice. Two mice are heterozygous for both traits. If these mice are crossed, what fraction of offspring can be expected to have blue eyes?

Two pure breeding plants are crossed. One has purple flowers and the other has white flowers. The first generation is composed of only purple flowers. When the first generation is self pollinated, there is a 3 to 1 ratio of purple to white flowers in the second generation.

What percentage of the second generation has a heterozygous genotype?