The expected genotypes of the offspring a cross between a male and a female are shown.

50% homozygous dominant (BB)
0% homozygous recessive (bb)
50% heterozygous (Bb)

What is the genotype of the parents if allele B is dominant over allele b?

The genotype of one parent is BB, and the genotype of the other parent is bb.
The genotype of both parents is BB.
The genotype of both parents is Bb.
The genotype of one parent is BB, and the genotype of the other parent is Bb.

The correct answer is "The genotype of one parent is BB, and the genotype of the other parent is bb."