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NEET UG BIOLOGY MCQ: PRINCIPLE OF INHERITANCE AND VARIATION
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A man with a certain disease marries a normal woman. They have eight children (3 daughters and 5 sons). All the daughters suffer from their father's disease but none of the sons is affected. What will be the mode of inheritance of this disease?
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Correct option: B
Sex-linked dominant
Option B (her father and maternal grand father were colour blind) is correct because a colourblind girl must inherit one X chromosome with the colourblindness allele from her father (who must therefore be colourblind) and one from her mother (who must therefore be at least a carrier, inheriting the allele from her father, the maternal grandfather).
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