Genetic variation question

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jolileia
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Genetic variation question

Post by jolileia » Wed Mar 08, 2006 1:32 pm

We know that natural selection including dominant has hightest fitness, recessive has highest fitness, fitness codominance, and fitness underdominance. Under what situation of natural selection is most genetic variation maintained over time? Why genetic variation is maintained in this situation and why it is either low or absent in the other situations?
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Vincenze
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jolileia...

Post by Vincenze » Fri Mar 24, 2006 12:09 pm

I think I understand your question, sorry if I don't...

I would say that genetic variation is highest when there are more selection pressures acting on a species. More factors making the species evolve.

On the other hand... there will be less genetic variation when there are less pressures on that species to evolve. Think of it as though the species fits in perfectly to its environment and doesn't need to evolve anymore.

Look at examples of species that have changed little over the past few million years and they will show less variation.

I hope that helps.

Vincenze.

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