Which of the following occurs due to the presence of an autosome linked dominant trait?
Answer: (B) Myotonic dystrophy. Answer: (B) Myotonic dystrophy Solution: Myotonic dystrophy is the NCERT example of an autosomal dominant trait.
- A.Sickle cell anaemia
- B.Myotonic dystrophy✓
- C.Haemophilia
- D.Thalassemia
Correct Answer
(B) Myotonic dystrophy
Solution & Explanation
Answer: (B) Myotonic dystrophy Solution: Myotonic dystrophy is the NCERT example of an autosomal dominant trait. Sickle cell anaemia and thalassemia are autosome-linked recessive disorders, and haemophilia is a sex (X)-linked recessive disorder, so none of these are autosome-linked dominant. Hence myotonic dystrophy is the answer. NCERT Reference: NCERT Class XII, Ch 4, p.73, lines 28-29: "Figure 4.14 Representative pedigree analysis of (a) Autosomal dominant trait (for example: Myotonic dystrophy) (b) Autosomal recessive trait (for example: Sickle-cell anaemia)"