Guinea pig coat color is determined by a single gene. The allele for black coat color is dominant to brown. In a cross between two black-haired guinea pigs, 20 offspring are born. If both parents were heterozygous, probability would predict that approximately how many of the 20 offspring would have brown hair?

Question

Ralphie

Biology

30 August, 07:21

Guinea pig coat color is determined by a single gene. The allele for black coat color is dominant to brown. In a cross between two black-haired guinea pigs, 20 offspring are born. If both parents were heterozygous, probability would predict that approximately how many of the 20 offspring would have brown hair?

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Answers (2)

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Shaylee · Answer 1

Answer: 5

The representation of the genotypes of heterozygous parents with dominant black coat is: Bb

In F1 generation by the cross of parents, the type of hair colour of the offspring can be predicted by punnet squares.

Offspring that are homozygous dominant (bb) : 1 out of 4 or 1/4=25%

For 20 offsprings, the number of offsprings with brown hair = (¼) 20 = 5

Karen Brooks · Answer 2

1/4 offsprings are going to have brown hair so, 5 offsprings will have brown hair out of 20