In a Certain Breed of Dog,the Alleles B and B

question 30

Multiple Choice

In a certain breed of dog,the alleles B and b determine black and brown coats,respectively.However,the allele Q of an unlinked gene is epistatic to the B and b color alleles,resulting in a gray coat (q has no effect on color) .If animals of genotype B/b;Q/q are intercrossed,what phenotypic ratio is expected in the progeny?

• A)1 black,2 gray,1 brown
• B)3 black,12,gray,1 brown
• C)4 black,9 gray,3 brown
• D)9 black,1 gray,6 brown
• E)9 black,4 gray,3 brown

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