Question

Small populations are prone to change in allelic frequencies which decrease genetic variability; this is explained by

• A. Sewall - Wright effect
• B. Genetic load
• C. Genetic flow
• D. Mutation

Answer 1

The correct option is A Sewall - Wright effect

• Genetic drift or Sewall Wright effect is a change in the gene pool of a small population that takes place strictly by chance.
• Genetic drift can result in genetic traits being lost from a population hence decreasing genetic variability.
• Genetic drift can occur only in small, isolated populations in which the gene pool is small enough that chance events can change its makeup significantly.

So, the correct option is 'Sewell- Wright effect'.