NEET 2001 Biology question

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 aabbCorrect
(3)AABB and aabb
(4)None

Answer: (2)

Solution

AB/ab is a heterozygote with A and B on one chromosome and a and b on the homologue; ab/ab is the homozygous recessive tester. For linked genes (complete linkage) the heterozygote produces only the parental gametes AB

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Question ID VK-088844