One version of it can be used to explain progressive decreases in genetic diversity as humans migrated from Africa, the serial version.
The formulator of this idea rejected the shifting balance theory, instead stating that geographic isolation was required for speciation, and that this idea along with gene loss and small population size could accelerate speciation. One consequence of this is the high incidence of Huntington's disease among descendants of the original Afrikaners in South Africa. One version of it can be used to explain progressive decreases in genetic diversity as humans migrated from Africa, the serial version. This can also be more generally depicted, if the population increases, as a bottleneck. An extreme example of genetic drift, for 10 points, name this effect, formulated by Ernst Mayr, that results when a new population is started by a sample not representative of the larger parent population.
The formulator of this idea rejected the shifting balance theory, instead stating that geographic isolation was required for speciation, and that this idea along with gene loss and small population size could accelerate speciation.
{founder} effect [prompt on “{genetic drift}” or “{bottleneck}” before mentioned]