Expected number of SNPs in a sample of size `k`

Question

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.

user438383 · Accepted Answer

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

Expected number of SNPs in a sample of size `k`

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