JAMB Biology 2010 Objective — Question 47

Question 47 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2010 Objective paper, with the correct answer and a full explanation.

If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is

A. 3/4
B. 1/2
C. 1/4Correct
D. 1

Explanation

Let each parent be Tt. Crossing Tt × Tt gives a ratio of 1 TT : 2 Tt : 1 tt, meaning the probability of a recessive phenotype (tt) offspring is 1/4.

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