Genetic Drift
Storyboard Text
- Genetic Drift
- There are 2 species of squirrels in a forest; Their alleles are brown (B allele) and white (b allele).
- This is a small population of squirrels, in which the 2 phenotypes have remained prevalent in this environment.
- After a disastrous earthquake, a bottleneck effect (when population size is reduced and then increased in population size) occurs, and the white phenotype is lost.
- After multiple generations, the B allele frequencies have increased until the entire population has the brown phenotype.
- Due to genetic drift (a random change in the allele frequencies in a population to the next generation due to random chance), the entire population of squirrels has changed from half white and half brown to all brown, causing less genetic diversity.
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