WAEC Biology 2009 Objective — Question 55

Question 55 of 60 from the West African Examinations Council (WAEC) Biology 2009 Objective paper, with the correct answer and a full explanation.

What would be the phenotypic ratio of the offspring of a cross between a heterozygous dominant parent and a double recessive parent?

A. A. 12:1
B. B. 1:1Correct
C. C. 3:1
D. D. 2:1

Explanation

A cross between a heterozygous dominant parent (Aa) and a double (homozygous) recessive parent (aa) produces offspring in a 1:1 ratio of dominant to recessive phenotypes.

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