11 - A variant on this theme proposed by Hampton Carson an...

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1. Small isolated populations 2. Genetic drift via population bottleneck or founder event => new allele frequencies 3. new "genetic environment" => different response to selection than in main population 4. effect is a major genetic change = " genetic revolution " One consequence is that speciation may not be dichotomous . Important consequence: rapid divergence, unlikely to leave fossil intermediates (these possibilities will come in to play when we discuss "punctuated equilibrium" later).
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Unformatted text preview: A variant on this theme proposed by Hampton Carson an influential evolutionary biologist from the University of Hawaii is Founder-Flush speciation : 1. population initiated with small number of individuals (founders) 2. flush in population size; relaxed selection during this phase; low fitness recombinants survive 3. crash in population size; selection and drift determine which genotypes survive....
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