Topic: Sex-linked inheritance, Mendelian and chromosomal disorders· Genetics and Evolution

Which of the following most appropriately describes haemophilia ?

1. Recessive gene disorder

2. X - linked recessive gene disorder

3. Chromosomal disorder

4. Dominant gene disorder

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Answer: 2. X - linked recessive gene disorder

Key idea: Haemophilia is caused by a recessive gene on the X chromosome, so it is the most precise description to call it an X-linked recessive disorder.

Option (1) is true but too general. It is not a chromosomal disorder (no chromosome number or structure change) and it is not dominant. Males (XY) are affected more often because they have only one X.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which of the following most appropriately describes haemophilia ?

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