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Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
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Polymorphism Polymorphism
wrote...
13 years ago
Is there any one value expected for tajima's D for a locus evolving under the neutral theory of evolution?  If so, what is it and why? 

I don't understand how a value is determined to be low enough to be suggestive of a natural selection.  Is it absolute (for example any value under 0 suggests natural selection) or relative to other value of tajima's D for surrounding loci. 
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wrote...
#1
Educator
13 years ago
No, I think it varies depending on your data. For instance, a negative Tajima's D signifies an excess of low frequency polymorphisms, indicating population size expansion and/or positive selection. A positive Tajima's D signifies low levels of both low and high frequency polymorphisms, indicating a decrease in population size and/or balancing selection.
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