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A and B genes are linked what shall be genotype of progeny in a cross between AB/ab and ab/ab?

1. AAbb and aabb
2. AaBb and aabb
3. AABB and aabb
4. None of these

Correct answer: AaBb and aabb

Solution

The linked heterozygote AB/ab produces parental gametes AB and ab. The testcross partner ab/ab can only contribute ab, so the offspring are AB/ab and ab/ab, which are written as AaBb and aabb.

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