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founder effect

noun Biology.

the accumulation of random genetic changes in an isolated population as a result of its proliferation from only a few parent colonizers.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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"A knowledge of the Globe and its various inhabitants, however slight ... has a kindred effect with that of seeing them as travellers, which never fails, in uncorrupted minds, to weaken local prejudices, and enlarge the sphere of benevolent feelings."

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