a1 Department of Mathematics University of Western Australia Nedlands, W. A. 6009, Australia
Individuals in a population which grows according to the rules defining the Markov branching process can mutate into novel allelic forms. We obtain some results about the time of the last mutation and the limiting frequency spectrum. In the present context these results refine certain results obtained in the discrete time case and they answer some conjectures still unresolved for the discrete time case.
(Received April 16 1987)
1980 Mathematics subject classification (Amer. Math. Soc.) (1985 Revision)
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