NCERT · Class 10 · Science · HeredityWhich of the following is an example of a sex‑linked trait in humans?
Answer: Colour blindness is a classic X‑linked recessive trait in humans.
Explanation: The gene responsible is located on the X chromosome. Males (XY) who inherit the defective allele on their single X chromosome express the condition, while females (XX) need two copies to be affected.
Other options like cystic fibrosis and sickle‑cell anaemia are autosomal recessive, not sex‑linked.
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity.
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity.
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Heredity.