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42 results
  • Invasion and Extinction Dynamics of Mating Types Under Facultative Sexual Reproduction. [Journal Article]
    Genetics 2019; 213(2):567-580Czuppon P, Constable GWA
  • In sexually reproducing isogamous species, syngamy between gametes is generally not indiscriminate, but rather restricted to occurring between complementary self-incompatible mating types. A longstanding question regards the evolutionary pressures that control the number of mating types observed in natural populations, which ranges from two to many thousands. Here, we describe a population geneti…
  • Evolution of the Two Sexes under Internal Fertilization and Alternative Evolutionary Pathways. [Journal Article]
    Am Nat 2019; 193(5):702-716Lehtonen J, Parker GA
  • Transition from isogamy to anisogamy, hence males and females, leads to sexual selection, sexual conflict, sexual dimorphism, and sex roles. Gamete dynamics theory links biophysics of gamete limitation, gamete competition, and resource requirements for zygote survival and assumes broadcast spawning. It makes testable predictions, but most comparative tests use volvocine algae, which feature inter…
  • Anisogamy evolved with a reduced sex-determining region in volvocine green algae. [Journal Article]
    Commun Biol 2018; 1:17Hamaji T, Kawai-Toyooka H, … Nozaki H
  • Male and female gametes differing in size-anisogamy-emerged independently from isogamous ancestors in various eukaryotic lineages, although genetic bases of this emergence are still unknown. Volvocine green algae are a model lineage for investigating the transition from isogamy to anisogamy. Here we focus on two closely related volvocine genera that bracket this transition-isogamous Yamagishiella…
  • The evolution of sexes: A specific test of the disruptive selection theory. [Journal Article]
    Ecol Evol 2018; 8(1):207-219da Silva J
  • The disruptive selection theory of the evolution of anisogamy posits that the evolution of a larger body or greater organismal complexity selects for a larger zygote, which in turn selects for larger gametes. This may provide the opportunity for one mating type to produce more numerous, small gametes, forcing the other mating type to produce fewer, large gametes. Predictions common to this and re…
  • Phototaxis and chemotaxis of brown algal swarmers. [Review]
    J Plant Res 2017; 130(3):443-453Kinoshita N, Nagasato C, Motomura T
  • Brown algae exhibit three patterns of sexual reproduction: isogamy, anisogamy, and oogamy. Unicellular swarmers including gametes and zoospores bear two heterogenous flagella, an anterior flagellum with mastigonemes (fine tripartite hairs) and a posterior one. In seawater, these flagellates usually receive physico-chemical signals for finding partners and good habitats. It is well known that brow…
  • Social amoebae mating types do not invest unequally in sexual offspring. [Journal Article]
    J Evol Biol 2017; 30(5):926-937Douglas TE, Queller DC, Strassmann JE
  • Unequal investment by different sexes in their progeny is common and includes differential investment in the zygote and differential care of the young. The social amoeba Dictyostelium discoideum has a sexual stage in which isogamous cells of any two of the three mating types fuse to form a zygote which then attracts hundreds of other cells to the macrocyst. The latter cells are cannibalized and s…
  • What do isogamous organisms teach us about sex and the two sexes? [Review]
    Philos Trans R Soc Lond B Biol Sci 2016; 371(1706)Lehtonen J, Kokko H, Parker GA
  • Isogamy is a reproductive system where all gametes are morphologically similar, especially in terms of size. Its importance goes beyond specific cases: to this day non-anisogamous systems are common outside of multicellular animals and plants, they can be found in all eukaryotic super-groups, and anisogamous organisms appear to have isogamous ancestors. Furthermore, because maleness is synonymous…
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