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.

  • $\begingroup$ Try using Sci-Hub. $\endgroup$
    – Simon
    Sep 11 at 2:45

1 Answer 1


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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