A white-furred (H) mouse breeds with a black-furred (h) mouse and all of the offspring have gray fur. What genotypes could the parents NOT have?

Question

A. HH x hh
B. Hh x Hh
C. hh x hh
D. Hh x hh

Answer 1

The genotypes that the parents could NOT have are:
A. HH x hh
C. hh x hh

Explanation: If one parent is homozygous dominant (HH) and the other parent is homozygous recessive (hh), all offspring would be heterozygous (Hh) and have gray fur, not black.