JAMB Biology 2020 Objective — Question 15

Question 15 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2020 Objective paper, with the correct answer and a full explanation.

15. The phenotypic ratio of the offspring obtained from a cross between a tall plant and a heterozygous tall plant is (a) 1:3 (b) 2:1 (c) 1:1 (d) 3:1

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

Explanation

Cross of Tt x Tt gives genotypic ratio 1 TT : 2 Tt : 1 tt, and phenotypic ratio 3 tall : 1 short (tall:short = 3:1).

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