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What effects on fitness would combining/breeding two populations from very different environments have vs. two populations...

What effects on fitness would combining/breeding two populations from very different environments have vs. two populations from very similar environments (with ties to evolutionary mechanisms, i.e. mutation, genetic drift, gene flow, or natural selection)?

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Answer #1

As ,two population from similar place will have similar gene and may have been developed loss of heterozygosity .

But two different populations from two different environments will have various different genetic formula as they have to live on the different environments thus gene mutation will be more gene flow will be more, and genetic drift will not be happens and thus more heterozygosity will come and thus fitness of offspring of next cases will be more fitted because they can be able to maintain both type of environment rather than one type as the case 1 offspring will do.

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