Question

DNA-sequencing studies fora gene in populations of two closely related species produce thefollowing numbers of sites that vary:

Synonymouspolymorphisms	50
Nonsynonymouspolymorphisms	20
Nonsynonymous speciesdifferences	2
Synonymous speciesdifferences	18

Does this result support aneutral evolution of the gene? Does it support and adaptivereplacement of amino acids? What explanation would you offer forthe observations?

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