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what you mean by parthenogenesis& what could be it's reason?
Parthenogenesis is most simply defined as reproduction without fertilization. More specifically, it occurs when a female gamete develops a new individual without being fertilized by a male gamete.The name itself comes from the Greek words parthenos or "virgin" and genesis or "creation". This is because it involves the production, activation, and development of a female egg which is a specialized reproductive cell (Kaufman, 1983). Few Vertebrates examples:

    komodo dragons
    mole salamders
    hammerhead sharks
    some reptiles
    some amphibians
Invertebrates
Aphids,water fleas etc.


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