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.
Över 30 miljoner storyboards skapade