CBSE 2025, Compartment, Set 1

Question

A man with a certain disease marries a normal woman. They have four children (three daughters and one son). All the daughters suffer from their father's disease but the son is not affected. Which of the following mode of inheritance do you suggest for this disease? A). Autosome Linked Recessive B). Sex-linked Dominant C). Autosome Linked Dominant D). Sex-linked Recessive

Edvaya · Accepted Answer

The correct answer is Sex-linked Dominant. **SOLUTION** This specific inheritance pattern indicates a **Sex-linked (X-linked) Dominant** trait. A father passes his X chromosome exclusively to all of his daughters and his Y chromosome exclusively to his sons. Since all the daughters inherited the disease but the son did not, the disease-causing allele must be firmly located on the father's X chromosome. Because the daughters show the trait even though they received a normal X from their mother, the trait is dominant.

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Biology > Reproduction And Genetics > Principles Of Inheritance And Variation

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