A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab:

AAbb and aabb

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AaBb and aabb

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AABB and aabb

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None

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Solution

The correct option is B AaBb and aabb
Two genes are said to be under linkage or linked when they are located on the same chromosome and have the tendency to be inherited together.
If A and B are linked, then a cross between AB/ab and ab/ab,
ab
AB AaBb
ab aabb
Therefore the progeny in a cross between AB/ab and ab/ab will have the genotype AaBb and aabb.

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