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  4. Assertion: A person may be a haemophilic, only if his mother is a carrier or colourblind. Reason: The male parent cannot pass on a sex-linked gene to his son.

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Q. Assertion : A person may be a haemophilic, only if his mother is a carrier or colourblind.
Reason : The male parent cannot pass on a sex-linked gene to his son.

AIIMSAIIMS 2018Principles of Inheritance and Variation

Solution:

Haemophilia is a X-linked disease. As a person receives X chromosome from mother and Y from father, therefore the person may be a haemophilic if his mother is carrier of the disease. The person will be certainly haemophilic if his mother is haemophilic.

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