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Q.

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

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a

bb

b

BB/Bb

c

BB

d

Bb

answer is D.

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Detailed Solution

 In order to find out the genotype of the  dominant trait like black seed(BB) in a plant, it is crossed with recessive plant with white seed (bb) .Such cross is known as test cross.

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In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?