Question

A student runs a simulation to examine allele frequencies in a population over 20 generations. In the initial trial, the student sets the population size to 200, and there is no natural or sexual selection, gene flow, or mutations. In this trial, there was not a significant change in the allele frequencies.
In the next trial, the student sets the population size to 50. All other parameters are the same as the first trial. In this trial, the student observes a significant change to the allele frequencies.
What is the cause of evolution in this population?

• A. Artificial selection
• B. Environmental change
• C. Genetic drift
• D. Migration

Answer 1

The correct option is C Genetic drift

Genetic drift:- Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce is called as genetic drift. At first thought, genetic drift and inbreeding appear to populations then there is no expected change in the mean allele frequency

So, the correct answer is 'Genetic drift'