A geneticist crossed pure breeding black mice with pure breeding brown mice. All the 992 mice in the F1 generation had black coats. When these
mice were crossed, they yielded 961 black coated mice and 317 brown coated mice.
How could you account for the ratio of black coated to brown coated mice in the F2 generation? Select all that apply

the answer is c

a and b are wrong because the parents were pure brown or black, meaning they both were homozygous ( BB OR bb) and not heterozygous (Bb)

d is wrong because the recessive allele for a brown coat does not disappear on f2

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