Genetic Drift Framework
Random change in gene frequencies
Genetic drift refers to the random change in the frequency of a gene or genetic trait in a population over time. This can occur through various mechanisms, including founder effects, genetic bottlenecks, and mutations. Genetic drift can lead to the loss or fixation of certain genes, resulting in evolutionary change.
- Genetic drift is a random process that can lead to evolutionary change.
- Genetic drift can occur through various mechanisms, including founder effects and genetic bottlenecks.
- Genetic drift can result in the loss or fixation of certain genes.
- Identify the mechanism of genetic driftDetermine whether the change in gene frequency is due to a founder effect, genetic bottleneck, or mutation.Pro tipConsider the population size and structure when evaluating the mechanism of genetic drift.WarningGenetic drift can be difficult to distinguish from other evolutionary processes, such as natural selection.
- Evaluate the impact of genetic drift on the populationAssess the effects of genetic drift on the population's gene pool and evolutionary trajectory.Pro tipConsider the potential consequences of genetic drift on the population's adaptability and fitness.WarningGenetic drift can lead to the loss of genetic variation, reducing the population's ability to adapt to changing environments.
The peppered moth evolved from a light-colored to a dark-colored morph in response to the industrial revolution, which led to an increase in dark-colored tree trunks. This change was driven by natural selection, but genetic drift also played a role in the evolution of the moth population.
The concept of genetic drift was first introduced by Sewall Wright in the 1920s, as a way to explain the random fluctuations in gene frequencies that occur in small populations.