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Q.

The possibility of haemophilic female is extremely rare due to which of the following reasons?

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a

Mother must be haemophilic who can not survive and father must be normal.

b

Father should be haemophilic who is unviable in the later stage of life and mother has to be a carrier.

c

Mother and father should be carriers who can not survive till their reproductive life.

d

Father should be haemophilic and mother should be normal without the trait.

answer is B.

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Detailed Solution

For a female to be hemophilic, she must inherit the Xh chromosome from both her mother (who is a carrier) and her father (who is hemophilic). This situation is relatively rare because hemophilic males often do not survive to reproduce. 

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