Question

Which of the following occurs due to the presence of an autosome linked dominant trait?

• A. Sickle cell anaemia
• B. Myotonic dystrophy
• C. Haemophilia
• D. Thalassemia

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Genetic disorders are classified based on the type of chromosome involved (autosomal or sex-linked) and the nature of the allele (dominant or recessive).
Detailed Explanation:
- Myotonic dystrophy: An autosomal dominant trait. Only one copy of the defective gene is needed to express the disorder.
- Sickle cell anaemia: An autosomal recessive trait.
- Thalassemia: An autosomal recessive trait.
- Haemophilia: An X-linked recessive trait.
Step 2: Final Answer:
Myotonic dystrophy is the correct example of an autosomal dominant trait.