Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 15 PCB Single Correct MCQ
Published on: August 14, 2026

In a random mating population in an Hardy-Weinberg equilibrium, which of the following brings about a change in gene frequency in a non - directional manner?

A
Controlled breeding
B
Random drift
C
Selection
D
Migration

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Text Solution

Verified by Experts
The correct answer is:
B

• Controlled breeding: This is intentional and directional, so it does not cause random changes.

• Selection: Always directional, because it favors certain alleles that increase fitness.

• Migration: Changes allele frequencies, but usually in a directional way (towards the allele distribution of the incoming population).

• Random drift (Genetic drift): This refers to random fluctuations in allele frequencies due to chance events. It is non-directional, because alleles may increase or decrease purely by chance, not due to adaptive advantage.

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