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As shown in the previous section, genetic drift causes its most dramatic and rapid changes in small populations.

However, even a population that is large most of the time but has an occasional generation of very small size can experience pronounced evolutionary changes due to drift in the generation of small size.

Thus, the pronounced evolutionary changes induced by the single generation of small population size are "frozen in" by subsequent population growth and have a profound and continuing impact on the gene pool long after the population has grown large.

These computer simulations show that genetic drift can cause major evolutionary change in a population that normally has a large population size as long as either • the population was derived from a small number of founding individuals drawn from a large ancestral population (founder effect) or • the population went through one or more generations of very small size followed by subsequent population growth (bottleneck effect).

An Adviser is needed to assist with all aspects of the development of livestock and agriculture on the Island.

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