500
A woman with blonde hair (bb) marries a man with brown hair but carries the blonde allele (Bb). If they have 4 children, what will be the phenotypes of all 4 (on average)? What does the genotype of the F1 generation tell you about the P generation (the new grandparents)?
What is 2 will have blonde hair, 2 will have brown hair. Maternal grandparents were either both blonde or carriers, paternal grandparents cannot be determined