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Question

A man whose father is a colourblind, marries a woman, who is a daughter of a colourblind mother. The offsprings of this couple will be 


A
All daughter and sons are colourblind.
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B
50% colourblind and 50% normal sons.
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C
Carrier normal son and colourblind daughter.
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D
Colourblind sons and normal daughters.
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Solution

The correct option is B 50% colourblind and 50% normal sons.
A man is normal and his father is a colourblind, but here X chromosome is not transmitted from his father. Women is carrier because her mother is colourblind. So, normal man with carrier woman, Hence, your cross is as follows:
(X Y) x (Xc X)
Based on this crossing, from the above given figure we can conclude that there is a 50% chance of producing a son who is colorblind and 50% are normal sons.
So, the correct answer is option B.


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Biology

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