Suddenly wiping out a large portion of the gene pool is known as the:

1. Chance events can remove alleles from a population wholesale. 2. An event may suddenly wipe out a large portion of the gene pool. 3. That is known as the bottleneck effect. 4. The founder effect instead starts a new population from an unrepresentative sample. _Source: OpenStax Biology 2e (CC BY 4.0), Ch 19 'The Evolution of Populations', sections 19.1-19.3_