JAMB Biology 2021 Objective — Question 30
Question 30 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2021 Objective paper, with the correct answer and a full explanation.
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30. Given that both parents are heterozygous for a particular trait the probability that an offspring will be recessive for that trait is (a) 1/2 (b) 3/4 (c) 1/4 (d) 1
- A. 1/2
- B. 3/4
- C. 1/4Correct
- D. 1
Explanation
Crossing two heterozygotes (Tt x Tt) gives offspring in the ratio 1 TT : 2 Tt : 1 tt, so the probability of a recessive (tt) offspring is 1/4.
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