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Consider a Wright-Fisher population of constant size N. We sample k haplotypes in this population. What is the expected number of SNPs?

I think the answer should be in Watterson (1975) but it looks like my institution does not pay for access to this journal.

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Let $\theta = 4n\mu$, then $E(S) = \theta\sum\limits_{i=1}^{k-1}\frac{1}{i}$, assuming infinite sites model. This is indeed given by Watterson (1975).

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