Segregating sites in a gene conversion model with mutation

Formulae for the expectation and variance of the number of segregating and homogeneous sites in a sample of two chromosomes are found. The model inclu des gene conversion and infinitely-many-alleles mutation in a coalescent fr amework. The corresponding infinitely-many-sites model limits are also foun d. The formulae for the expectation are extended to any sample size. Compar isons are drawn between the pure mutation model and the model where gene co nversion has been added. (C) 1998 Academic Press.