WAEC Biology 2025 Objective — Question 47
Question 47 of 50 from the West African Examinations Council (WAEC) Biology 2025 Objective paper, with the correct answer and a full explanation.
Advertisement
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
Colour blindness is X-linked, and males express the trait if they inherit the allele. In other words, males cannot be carriers - they are either normal or they suffer from the trait. Females (with two X chromosomes) are carriers if they have one X with the colour blindness allele, or sufferers if both X chromosomes are defective. This makes 'males are often carriers' the incorrect statement.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.