The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called founder effect.

Here's why:

* Founder effect: This occurs when a small group of individuals breaks off from a larger population to establish a new colony. The new colony's gene pool will be a subset of the original population's gene pool, potentially lacking some alleles. This can lead to a significant difference in allele frequencies between the new colony and the original population.

Let me know if you'd like more details on genetic drift!