Eye color is determined by genetic combination. Let R represent the gene for brown eyes and L represent the gene for blue eyes. Any gene combination including R results in brown eyes. Consider the offspring of a parent with homozygous brown-eyed,RL,gene combination.

Question

What percent of the possible genetic combinations are carriers for the blue-eyed gene?

Thank you for your time and help in solving this problem.

Answer 1

biologists use a Punnett square to show the geneotypes

if both parents are RL, the following outcomes are equally probable
... RR, RL, LR, LL