WAEC Biology 2009 Objective — Question 48
Question 48 of 60 from the West African Examinations Council (WAEC) Biology 2009 Objective paper, with the correct answer and a full explanation.
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A man heterozygous for albino gene marries a woman who is also heterozygous for the gene. Both are normal for skin colour. The probability that they will have an albino child is
- A. A. 1/8
- B. B. 1/4Correct
- C. C. 1/2
- D. D. 3/4
Explanation
Since both parents are heterozygous carriers (Nn x Nn), the expected ratio of offspring is 1 NN : 2 Nn : 1 nn, so the probability of an albino child (nn) is 1/4.
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