Genetic Variation in a Population - Research Article from Macmillan Science Library: Animal Sciences

Robin Cook
This encyclopedia article consists of approximately 6 pages of information about Genetic Variation in a Population.
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The Amount of Genetic Variation

In the 1960s there was considerable debate regarding how much genetic variation actually exists in populations. The common view was that polymorphic loci are fairly rare. Then, the development of the technique of gel electrophoresis allowed biologists to examine patterns of protein variation across populations and to quantify genetic variation.

Biologists detected surprisingly large amounts of genetic variation. In most vertebrate species, for example, approximately 30 percent of genes were found to be polymorphic. Studies in the 1970s in humans showed that genetic variation occurs at approximately the same levels as in other animal species. The studies in humans also revealed, famously, that so-called human races are not real biological groupings. It was found that there is considerably more genetic variation within races than between them.

Since then it has been the absence of genetic variation that is considered anomalous. Absence...

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This section contains 1,536 words
(approx. 6 pages at 300 words per page)
Buy the Genetic Variation in a Population Encyclopedia Article
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Macmillan Science Library: Animal Sciences
Genetic Variation in a Population from Macmillan Science Library: Animal Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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