Answer;
Decrease in genetic variation
Genetic drift in a population affects the gene pool in that it decreases the genetic variation.
Explanation;
- Genetic drift is the change in a gene pool due to chance events, such as disasters, or war among others. Smaller populations are more affected by genetic drift.
- It is the gradual changes in gene frequencies in a population due to random events. Genetic drift may cause a bottleneck effect or founder effect on a population.
- Bottleneck effect occurs when a natural disaster hits and the population is drastically decreased then the surviving population is dramatically altered by genetic drift.
- Founder effect on the other hand occurs when one individual moving to an island or a new area as a result in dramatically different allele frequencies.