Asmall founding population of a few hundred europeans in north america has an unusually high frequency of an allele that causes polydactyly (six fingers). what is this an example of

A small founding population of a few hundred europeans in north america has an unusually high frequency of an allele that causes polydactyly (six fingers). what is this an example of the Founder Effect.
When there is a lack of genetic variation and dramatic decrease in genetic diversity, this is the founder effect.

Nitrate poisoning for the first onebaby blue syndrome