The genotypes that cannot be determined by inspecting the phenotypes of the offspring of a cross are:?

Question

a)homozygous dominant and homozygous recessive
b)codominant
c)codominant and homozygous recessive
d)homozygous dominant and heterozygous dominant

Answer 1

d)homozygous dominant and heterozygous dominant

Answer 2

D would be more precise. Both homozygous and heterozygous dominant exhibit only dominant phenotype. So, you cannot determine the genotypes by mere inspection of the physical appearance.