Androdioecy is a reproductive system found in species composed of a male population and a distinct hermaphrodite population. The Evolution of sexual reproduction is a major puzzle The first Fossilized evidence of sexually reproducing Organisms is from Eukaryotes of the Stenian In Biology, a species is one of the basic units of Biological classification and a Taxonomic rank. Male (♂ refers to the sex of an organism or part of an organism which produces small mobile Gametes called spermatozoa. In Biology a population is the collection of inter-breeding organisms of a particular Species; in Sociology A hermaphrodite is an organism having both male and female reproductive organs Such species are rare.
The conditions required for androdioecy to arise and sustain itself are theoretically so improbable that it was long considered that such systems would never be found.  However, androdioecy (and near-androdioecy) has now been documented in both phylogenetically distinct plant and animal species. Hence androdioecy has actually evolved independently several times.
- ^ D. Caenorhabditis briggsae is a small nematode closely related to Caenorhabditis elegans. Caenorhabditis elegans (ˌsiːnoʊræbˈdaɪtɪs ˈɛlɪgænz is a free-living Nematode (roundworm about 1  mm in length which Datisca glomerata is a species of plant native to California Nevada and Baja California known by the common name Durango root. Fraxinus lanuginosa ( Japanese Ash; Japanese: アオダモ Aodamo) is a species of ash native to Japan and southern The mangrove killifish or mangrove rivulus, Rivulus marmoratus, is a species of Fish in the Aplocheilidae family Plant sexuality covers the wide variety of Sexual reproduction systems found across the Plant kingdom Charlesworth, 1984.
- Bawa, 1980
- Charlesworth, B. 'The evolution of sex chromosomes'. Science 251 (1991): 1030-1033.
- Charlesworth, B. 'The nature and origin of mating types'. Curr. Biol. 4 (1994): 739-741.
- D. Charlesworth, 1985
- Darwin, 1877
- Lewis, 1942
- Lloyd, 1975
- Ross & Weir, 1976
- Wolf and Takebayashi, 2004
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