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No gene flow: Animals do not enter or leave the population. Random mating: individuals pair by chance and not according to the Genotypes or phenotypes.
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Plant Speciation – Part 1 Spring 2010
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Population bottlenecks often result in reduced or no Genetic variation.
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Selection increases the frequencies of alleles that enhance survival Natural selection increases the frequencies of alleles that enhance gene flow, and
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Gene flow among small populations introduces new alleles. c. Natural Selection, such as disruptive selection, itself sometimes results in variations.
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Gene flow – the process of genes moving from one population to another. Population Genetics and Speciation Last modified by: Casey Dziuba Company:
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Gene Flow Gene flow is the exchange of genes between populations. If individuals move temporarily and mate in the new population (leaving a genetic contribution),
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Evolution of Populations Other Mechanisms of Genetic Change * * * * * * * * * Gene Flow Movement of Alleles From One Population To Another Increases Genetic variation
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Gene flow moves alleles from one population to another. How can this lead to evolution? Mutations produce the Genetic variation needed for evolution.
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Evolution and Speciation Gene Flow Gene flow- allele frequencies are changed by organisms migrating in and out of populations Genetic Drift Genetic drift- chance