Genetic Drift Vs. Gene Flow

Mountains and now breeds on the Santa Rita Mountains with another established population.

A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.

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Genetic diversity is decreased through this process.

Maria Concepcion Soto settled in the northern area of Venezuela. She suffered from a rare genetic disorder called Huntington’s Disease. As a result, the now 20,000 individuals who live there also have a high risk of Huntington’s Disease.

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One of the original Amish settlers who founded a new area for them had a rare, genetic disorder which causes short limbs and extra digits. Now, many within the population show this trait.

Genetic Diversity is increased through this process.

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A population of flowers on one side of a river transports pollen to flowers on the other side of the river