Assertion :Haemophilia is a recessive sex linked disease. Reason: Haemophilia occurs due to mutation of a structural gene on chromosome 15.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
Haemophilia also known as 'bleeder disease'. It is an example of recessive sex linked inheritance in human beings. It is masked in heterozygous condition. The person suffering from disease lack factors VIII and IX responsible for blood clotting. A small cut may lead to bleeding till death. Men are affected by this disease while women are the carriers.
Mutation of a structural gene on chromosome number 15 causes Marfan syndrome. This disease results in formation of abnormal form of connective tissues and characteristic extreme looseness of joints.
Thus, the correct answer is option C.

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