Random unidirectional change in allele frequencies that occurs by chance in all populations and espe

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

Accepted Answer

Sol.(d) [Key Concept: Genetic Drift — Random Allele-Frequency Change] Genetic drift is the random change in allele number and frequency in a gene pool due to chance (e.g., small size of population). It is caused by sampling error — error in the gene pool sample that forms the next generation. The sampling gene pool is generally small in size, and variability is also limited.

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