In rats, the allele for having a black coat (B) is dominant to the allele for having a brown coat (b). Two rats that are heterozygous for coat color have offspring. What is the probabilty (as a percent) of offspring that will be homozygous dominant?
The easiest way to solve this question is to use the Punnett Square method. Whenever two heterozygous genotypes are crossed, the offspring ratio will always be 1:2:1 (BB=25%, Bb=50%, bb=25%). I hope that helps!
