Two genes ‘A’ and ‘B’ are completely linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aabb). What would be the ratio of offspring in the next generation ?

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3 : 1

9 : 3 : 3 : 1

1 : 1

1 : 1 : 1 : 1

answer is D.

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Detailed Solution

In case of complete linkage dihybrid test cross ratio is 1 : 1 because hybrid produces only parental gametes AB and ab. Completely linked genes are not unlinked and hence recombinants are not formed.

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