Genetic Drift The Bottleneck Effect — a labelled NEET Biology diagram with a definitions lexicon.
Genetic Drift: The Bottleneck Effect Labelled parts: Original Diverse Population, Bottleneck Event, New Less Diverse Population, Genetic Drift, Reduced Genetic Variation. A sharp reduction in the size of a population due to environmental events, reducing the gene pool. Reduced genetic diversity that results when a population is descended from a small number of colonizing ancestors (related concept).