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Carriers vs Affected Individuals

If a man with...

Question

If a man with an X-linked dominant disease has six sons with a woman having a normal complement of genes, then the sons will

A

Not show any symptoms of the disease

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B

Show strong symptoms of the disease

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C

Three will show a disease symptom, while three will not

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D

Five will show a disease symptom, while one will not

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Solution

The correct option is A Not show any symptoms of the disease
The chromosomes in males are X and Y. The sons will receive the Y chromosome from the father and X chromosome from the mother.
Since the man is suffering from X-linked dominant disease and the woman has normal complement of genes, the daughters (if any) will be diseased and none of the sons will be diseased.
Thus the correct answer is option A.

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