In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).If two dihybrids (Bb Ss) are crossed, what fraction of the black, solid offspring will be homozygous?
A)4/16
B)9/16
C)1/9
D)3/16
E)3/4

Question

Quizplus · Accepted Answer

The homozygous black, solid offspring would be BBSS. The probability of BB is 1/4 and the probability of SS is 1/4. Therefore, the probability of BBSS is 1/4 * 1/4 = 1/16. Out of the 9/16 black, solid offspring, 1/16 are BBSS, so the fraction is 1/9.

In Cocker Spaniels, Black Coat Color (B) Is Dominant Over