Rhett and Scarlett are expecting a baby. Rhett's rich uncle has promised them $1 million if their baby has blue eyes and red hair. Brown eyes (B) are
dominant over blue eyes (b). Dark hair is (R) is dominant over red hair (r)
Rhett is heterozygous for brown eyes and dark hair, while Scarlett has blue
eyes and red hair. What is Rhett's genotype?*