What will be the probability of production of anyone gray individual when two gray progeny of cross IV are allowed to mate with each other?

100%

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75%

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50%

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25%

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Solution

The correct option is B 75%
cross IV G G
g Gg (gray) Gg (gray)
g Gg (gray) Gg (gray)
progeny G g
G GG (gray) Gg (gray)
g Gg (gray) gg (white)
In cross IV, no white offspring is produced. THis means gray female had genotype GG whereas white male had genotype gg. when two ghray progeny are crossed, 75% of the offsprings produced are gray as shown in the above crosses.
So, the correct option is '75%'.

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