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4.Principles of Inheritance and Variation
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A haemophilic woman marries a normal man, then

A

All the children will be normal

B

All the sons will be haemophilic

C

All the girls will be haemophilic

D

Half girls will be haemophilic

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Solution

Haemophilia is a recessive $X$-linked disease. A female with defected single $X$-chromosome is normal but, carrier of disease, and male with defected single $X$-chromosome is haemophilic.

Standard 12
Biology
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