automictic parthenogenesis

automictic parthenogenesis

Useful english dictionary. 2012.

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  • automictic parthenogenesis — pairing of one set of chromosomes in egg formation with a copy of itself, a type of virgin birth where no sperm is involved, e.g. in bonnethead shark, Sphyrno tiburo …   Dictionary of ichthyology

  • Parthenogenesis — (from the Greek παρθένος parthenos , virgin , + γένεσις genesis , creation ) is an asexual form of reproduction found in females where growth and development of embryos or seeds occurs without fertilization by a male. The offspring produced by… …   Wikipedia

  • automictic meiotic parthenogenesis — A normal reduction division occurs, followed by the fusion of the two nuclei so that the diploid number of chromosomes is restored; often the female pronucleus fuses with the second polar body nucleus, or two cleavage nuclei may fuse; only… …   Dictionary of invertebrate zoology

  • facultative meiotic parthenogenesis — The diploid chromosomal complement in the reduced oocytes is restored by fusion of the second polar nucleus with the egg pronucleus; see automictic meiotic parthenogenesis …   Dictionary of invertebrate zoology

  • automixis — n. [Gr. autos, self; mixis, mingling] Obligatory selffertilization; egg and sperm being derived from the same individual, as opposed to amphimixis; automictic parthenogenesis …   Dictionary of invertebrate zoology

  • automixis — noun A form of parthenogenesis in which two haploid gametes from the same meiosis combine See Also: automictic …   Wiktionary

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