Question

Assuming the allele for black hair (B) is completely dominant to blonde hair (b), construct a Punnett square showing the cross between a homozygous black-haired male and a homozygous blond-haired female. What are the phenotypic ratios for the offspring? What are the genotypic ratios? Are the offspring homozygous or heterozygous?

Answer 1

b: Bb:Bb: B

= 1:2:1

Offspring are heterozygous