Cross AABb X aaBb yields AaBB : AaBb : Aabb : aabb offsprings in the ratio of

0 : 3 : 1 : 1

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1 : 2 : 1 : 0

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1 : 1 : 1 : 1

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1 : 2 : 1 : 1

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Solution

The correct option is C 1 : 2 : 1 : 0
AABb
aaBb AB Ab
aB AaBB AaBb
ab AaBb Aabb
The cross obtains AaBB : AaBb : Aabb genotypes in 1: 2: 1 ratio. Genotype "aabb" is not the product of this cross. Thus, the correct answer is option B.

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