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.
-Have of the offspring from this cross were black and solid, and half of the offspring were black and spotted. Which of the following could be the genotype of the black, solid male?
A) BBSs
B) BBss
C) BbSS
D) BbSs
E) Bbss

Question

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. 
-Have of the offspring from this cross were black and solid, and half of the offspring were black and spotted. Which of the following could be the genotype of the black, solid male?
A) BBSs
B) BBss
C) BbSS
D) BbSs
E) Bbss

Quizplus · Accepted Answer

The black, solid male must be heterozygous for both traits (BbSS) to produce only black, solid offspring with the first female and a mix of black solid and black spotted with the second male.

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