3 models for genetic isolation

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3 models for genetic isolation

Post by hannahzarzar » Wed Aug 31, 2011 5:31 am

I am uncertain about my answer.The three models are not clearly defined. Please be honest in making corrections. Are these in fact "models?"

In your own words explain three models that bring about the genetic isolation of a population

• Allopatric and sympatric speciation- Something happens (i.e. geographical isolation, ecological isolation) to a population that isolates the gene flow. The two subpopulations are separated whereas there will be no reproduction. Allopatric refers to a geographic separation of populations of a single species that separate and then don’t have the opportunity to interbreed. Sympatric refers to ecological isolation (i.e. climate change) that does not involve barriers between the habitats; yet separates the species from interbreeding.

• Genetic divergence-no gene flow

• Reproductive Isolation- Even when the original population share the same habitat they are unable to interbreed.

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Post by Darby » Fri Sep 02, 2011 8:41 pm

I wouldn't consider climate change to be a source of ecological isolation.

Does genetic divergence happen without isolation? It doesn't seem like it would be in itself an isolation model.

You've defined reproductive isolation, but I'm not sure you've given a model. Depends on how the instructor defines it.

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