From a cross AABb x aaBb, the genotypes AaBB : AaBb Aabb : aabb will be obtained in the following ratio

1:1: 1: 1

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1:2:1:0

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0: 3: 1: 0

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1: 1: 1: 0

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Solution

The correct option is B 1:2:1:0
In the cross AABb X aaBb, the genotypes obtained are AaBB, AaBb and Aabb in a ratio of 1:2:1 whereas genotype aabb is not obtained.
So, the correct answer is '1:2:1:0'

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