9.4 genetic drift

what is genetic drift/Sewall wright effect

The random, non-directional change in allele frequency between generations. occurs in populations of large sizes, with less effect the larger the population.

what is founder effect

extreme example of genetic drift

when a small group moves away to totally new area and establishes a population and expands. due to small size

• different allele frequency from original population

• decreased genetic variation

what is bottle neck effect

• another example of genetic drift

• A natural disaster that severely reduces the size of a population.

• Survival is due to chance and not due to a specific trait.

explain how genetic drift is different from natural selection

Genetic drift is a random process where allele frequencies change by chance, particularly in smaller populations, while natural selection favors traits that improve survival and reproduction