If a boy's father has haemophilia and his mother has one gene for haemophilia; chance that boy w

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4.Principles of Inheritance and Variation

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If a boy's father has haemophilia and his mother has one gene for haemophilia; what is the chance that the boy will inherit the disease

A

$25\%$

B

$50\%$

C

$75\%$

D

$100\%$

(AIIMS-1999)

Solution

(b) Chance of a boy inheriting haemophilia solely depends upon the mother's nature irrespective of his father's nature.

If mother is heterozygous for disease,

chances are $50\%$ and if she is homozygous similarly,

then all his sons will inherit the disease.

Standard 12

Biology

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(AIIMS-2007)