In the mouse, gene A allows pigmentation to be deposited in the individual coat hairs; its allele a prevents such deposition of pigment, resulting in an albino. Gene B gives agouti (wild-type fur); its allele b gives black fur. What would the expected
ratio of the progeny be in a cross of a doubly heterozygous agouti mouse mated with a doubly homozygous recessive white mouse?
A) 9 (agouti) :3 (black) : 4 (albino)
B) 9 (black) : 27(albino)
C) 1 (agouti) :1 (black) : 2 (albino)
D) 3 (agouti) :4 (black) : 9 (albino)
E) 1 (agouti) :1 (black) :1 (albino)
Answer: C
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