JAMB Biology 2021 Objective — Question 8

Question 8 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2021 Objective paper, with the correct answer and a full explanation.

8. When an allele can express itself both in the homozygous pairing and the heterozygous pairing, it is said to be (a) recessive (b) dominant (c) an allelomorph (d) genetic

A. recessive
B. dominantCorrect
C. an allelomorph
D. genetic

Explanation

An allele that can express itself only in the homozygous pairing is recessive; one that expresses itself in both homozygous and heterozygous pairing is dominant.

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