8 Migration & gene flow

8 Migration & gene flow - BIO 370 Kirkpatrick Hall...

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BIO 370 Kirkpatrick & Hall, Fall 2004 p. 1 8. Migration (gene flow) Many species have clines A cline is a trend in a trait mean or gene frequency in space Example: White-tail deer are small in Texas and get larger as you go north Some clines directly reflect a gradient in the environment Example: Cyanide-producing clover are found in high frequency only where it does not freeze in winter Clines can also result from migration, or gene flow, that changes gene frequencies What does migration do? Migration mixes populations genetically, making them more similar It can introduce a gene from one population into another that does not have it Here migration plays a role like mutation How do we measure migration? The migration rate m is the fraction of individuals that have arrived in the population of interest from somewhere else Not all movement of individuals results in gene flow Example: Migratory birds and butterflies move huge distances every year, but return to breed very close to the place where they were born
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This note was uploaded on 11/25/2009 for the course BIO 51475 taught by Professor Kirkpatrick during the Spring '09 term at University of Texas.

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8 Migration & gene flow - BIO 370 Kirkpatrick Hall...

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