Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as

Options

(a) Mutation
(b) Migration
(c) Natural selection
(d) Genetic drift

Correct Answer:

Genetic drift

Explanation:

Genetic drift is random change in allele number and frequency in a gene pool due to chance (eg., small size of population). It is caused by sampling error or error in gene pool sample that is to form the next generation. The sampling gene pool is generally small in size. Variability is also limited.