A laboratory mouse homozygous for a specific allele is mated to a wild mouse that is heterozygous for that allele. One of the heterozygous individuals resulting from this cross is mated back to the wild field mouse parent. What proportion of the offspring will have the same genotype as the original laboratory mouse?

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Lena Wall

Biology

17 December, 18:54

A laboratory mouse homozygous for a specific allele is mated to a wild mouse that is heterozygous for that allele. One of the heterozygous individuals resulting from this cross is mated back to the wild field mouse parent. What proportion of the offspring will have the same genotype as the original laboratory mouse?

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Alfredo Duffy · Answer 1

A laboratory mouse homozygous for a specific allele is mated to a wild mouse that is heterozygous for that allele. One of the heterozygous individuals resulting from this cross is mated back to the wild field mouse parent. What proportion of the offspring will have the same genotype as the original laboratory mouse?

RR x Rr = RR, Rr, RR, and Rr 4:0 genotype

Rr x Rr = RR, Rr, Rr and rr 2:2 50:50%

50% of the offspring will have the same genotype as the original laboratory mouse