Respuesta :
Answer:
When there is a lower genetic flow.
Explanation:
Genetic drift is a major factor of evolution when the organism population size is small. In such a population, the random change in the allele frequency that is not a response to a selective pressure can become fixed in a population. The random change in population is called genetic drift.
The genetic drift is a major factor in evolution when there is lower gene flow and when there is no selective pressure and when there is a bottleneck in the environment.