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- W2137340084 abstract "INTRODUCTION Multicellular organisms are usually anisogamous with different mean sizes of gametes of different sexes or mating types. It is generally believed that isogamy (equal gamete sizes of different mating types) is the most primitive mating system (e.g. Maynard Smith, 1978; 1982; Hoekstra, 1987; Maynard Smith and Szathmary, 1995). Although we observe many isogamous species in algae, fungi, and protozoans (for review see Bell, 1982; Hoekstra, 1987), anisogamy has a much wider taxonomic distribution. Attempts to use evolutionary theory to understand this restricted distribution have met with limited success, as have attempts to understand the distribution of isogamy within groups that include both isogamous and anisogamous species, as observed in the freshwater green algal order Volvocales (Randerson and Hurst, 2001). However, there are numerous exceptions to fully accept the synthetic theory (Bell, 1978; Hoekstra, 1987). We use a series of mathematical models to help understand what might account for the comparative scarcity of isogamy. The models also produce some new hypotheses that may help explain some of the anomalies in the comparative data. It is generally believed that the evolution of mating types preceded the evolution of gamete size dimorphism (Hoekstra, 1987; Maynard Smith and Szathmary, 1995). For example, Hoekstra (1982, 1987) has proposed several possible mechanisms for the evolution of mating types in a randomly mating population. In the simplest mechanism, it is assumed that gamete adhesion was initially brought about by two complementary molecules." @default.
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- W2137340084 date "2011-04-14" @default.
- W2137340084 modified "2023-10-17" @default.
- W2137340084 title "The evolutionary instability of isogamy" @default.
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- W2137340084 doi "https://doi.org/10.1017/cbo9780511975943.003" @default.
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