In dogs, black coat color (B) is dominant over brown (b), and solid coat color (S) is dominant over white spotted coat (s). A cross between a black, solid female and a black, solid male produces only puppies with black, solid coats. This same female was then mated with a brown, spotted male. Half of the offspring from this cross were black and solid, and half of the offspring were black and spotted. What is the genotype of the brown, spotted male?
A) BBSS
B) BbSS
C) BBSs
D) BbSs
E) bbss

Question

Quizplus · Accepted Answer

The brown, spotted male must be homozygous recessive (bbss) to produce offspring with black and spotted coats when mated with a heterozygous black, solid female.

In Dogs, Black Coat Color (B) Is Dominant Over Brown