WAEC Biology 2017 Objective — Question 46

Question 46 of 50 from the West African Examinations Council (WAEC) Biology 2017 Objective paper, with the correct answer and a full explanation.

Assuming that A is the gene for normal skin colour and is dominant, while a is the gene for albinism and is recessive, what is the likely genotype of the couple which had 50% normal and 50% albino offspring?

A. A. AA, aa
B. B. Aa, aaCorrect
C. C. AA, Aa
D. D. Aa, Aa

Explanation

Thus, only a cross between Aa and aa can produce 50% albino and 50% normal. Don't forget that A is dominant over a.

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