The founder effect occurs when
- A
A new mutation spreads through a population, replacing most of the original genetic variation
- Bcheck_circle
A small group establishes a new population, carrying only a fraction of the source population's genetic variation
- C
A large group migrates between populations, exchanging most of the source population's genetic variation
- D
A subspecies hybridizes with another, combining both parental populations' genetic variation
Explanation
Drift on a population starting from a small founding group; explains, e.g., elevated frequencies of certain alleles in isolated human populations.