Lecture23_handout_21Oct11 - BioEE 1780 Evolutionary Biology...

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BioEE 1780 Fall 2011 Evolutionary Biology and Diversity Oct 21 MIGRATION AND GENE FLOW TEXT READING for this lectures (Oct 14): Freeman and Herron Chapter 7 section 7.1. MIGRATION A. Migration, or “gene flow” is the movement of alleles between populations. 1. Obviously, these alleles usually move by being carried by migrant individuals in the populations. There can also be “migration” of gametes in examples like long-distance transport of pollen by artificial mechanisms. B. Migration is an effective evolutionary force only if the migrant individuals or gametes actually contribute to the recipient gene pool. POPULATION SUBDIVISION A. Migration is meaningful as a concept only if populations are subdivided. 1. New subpopulations can be “founded” by migrant individuals that travel to a novel location. 2. Existing populations can become fragmented by barriers to gene flow. 3. Distant points in a species range can be “isolated by distance.” B. Populations founded by just a few individuals can differ in allele frequency from the
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Lecture23_handout_21Oct11 - BioEE 1780 Evolutionary Biology...

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