What is the genotype frequency for a cross between a heterozygous parent and a homozygous dominant parent?
a) 25% homozygous dominant: 50% heterozygous: 25% homozygous recessive
b) 50% homozygous dominant: 50% homozygous recessive
c) 100% heterozygous
d) 50% heterozygous: 50% homozygous recessive
e) 50% homozygous dominant: 50% heterozygous