On the Relation Between Sexual and Parthenogenetic Reproduction in Haplo-Diplontic Algae

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Abstract
In the laboratory the gametes of the multicellular diplohaplontic green alga Ulva mutabilis Foyn have the ability to develop parthenogenetically into sporophytes, and it is observed that the 2 alleles of the mating type gene thereby will have a different probability to be transferred to the next generation because of the different behavior of the zooids and the degree of diploidy in the 2 populations of parthenosporophytes. The consequence of this that an equilibrium between parthenogenetic and sexual reproduction theoretically must be realized by a sex-ratio different from 1. Abortive mating and the density of gametes are pointed out as important factors for whether or not an equilibrium between these 2 kinds of repriduction can be established.