Question

Genetic drift occurs in

• A. Small population
• B. Large population
• C. Unlimited population
• D. Diverse population

Answer 1

The correct option is A Small population

Genetic drift is also called genetic sampling error or Sewall Wright effect, 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 or becoming widespread in a population without respect to the survival or reproductive value of the alleles involved. A random statistical effect, genetic drift can occur only in small, isolated populations in which the gene pool is small enough that chance events can change its makeup substantially. In larger populations, any specific allele is carried by so many individuals that it is almost certain to be transmitted by some of them unless it is biologically unfavourable. So, genetic drift occurs in small population and not in large population, unlimited population and diverse population. Thus, option A is correct and other options are wrong.