Punnett Squares > Use Punnett Squares Practice Test

In poodles, the allele for black fur (B) is dominant to the gene for brown fur (b). Two poodles are crossed. One poodle is homozygous for black fur, and the other is heterozygous. What percentage of the offspring are expected to have black fur?

In a population of rats at a pet store, the allele for black fur is dominant (B) and the allele for brown fur is recessive (b). A rat with the genotype BB is crossed with a rat with the genotype Bb. Which describes the phenotype of the parent rats?