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UPSC 1999: Which one of the following genetic diseases is sex-linked?
(a)Royal haemophilia
(b)Tay Sachs disease
(c)Cystic fibrosis
(d)Hypertension
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Not attemptedCorrect Answer: (a) Royal haemophilia
Royal haemophilia (the form of haemophilia that afflicted the descendants of Queen Victoria) is inherited as an X-linked recessive trait, so it predominantly affects males while females are usually carriers. Tay-Sachs disease and cystic fibrosis are autosomal-recessive disorders, and essential hypertension is multifactorial, so none of these are sex-linked. ([britannica.com](https://www.britannica.com/science/hemophilia?utm_source=openai))
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What is the correct answer to this UPSC 1999 Science & Technology question?▼
The correct answer is option (a): Royal haemophilia. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biotechnology & Genetics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 114. It falls under Science & Technology > Biotechnology & Genetics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biotechnology & Genetics?▼
UPSC has asked 54 questions from Biotechnology & Genetics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.