Dynamics of finite populations : II. A time-homogeneous stochastic process describing the ultimate probability of and the expected time to fixation or loss of an allele or type in a population of variable size.

A time-homogeneous stochastic process was used to derive exact expressions for the ultimate probability of fixation or loss and the expected time to fixation or loss of an allele in a haploid population whose size is a Poisson random variable. The treatment included selection and multiple alleles.