NABTEB Biology 2025 Objective — Question 47
Question 47 of 50 from the National Business and Technical Examinations Board (NABTEB) Biology 2025 Objective paper, with the correct answer and a full explanation.
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Which of the following statements is not correct about colour blindness?
- A. It is a sex-linked trait
- B. Males are often carriersCorrect
- C. Females are not carriers
- D. The trait is controlled by a recessive gene
Explanation
A male cannot be a carrier of a sex-linked trait; he either suffers from the trait or is normal. A female may be a sufferer, carrier or normal - if one X-chromosome of a female is defective, the female is a carrier, so 'males are often carriers' is the incorrect statement.
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