parthenogenesis

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parthenogenesis

 [pahr″thĕ-no-jen´ĕ-sis]
a modified form of sexual reproduction in which a gamete develops into a new individual without the fertilization of an oocyte by a spermatozoon, as in certain arthropods and other animals; it may occur as a natural phenomenon or be induced by chemical or mechanical stimulation (artificial parthenogenesis). adj., adj parthenogenet´ic.

par·the·no·gen·e·sis

(par'the-nō-jen'ĕ-sis),
A form of nonsexual reproduction, or agamogenesis, in which the female reproduces its kind without fecundation by the male.
[G. parthenos, virgin, + genesis, product]

parthenogenesis

(pär′thə-nō-jĕn′ĭ-sĭs)
n.
1. A form of reproduction in which an unfertilized egg develops into a new individual, occurring commonly among insects and certain other arthropods.
2. The artificial activation of an unfertilized usually mammalian egg, resulting in an embryolike cell cluster from which stem cells can be harvested.

par′the·no·ge·net′ic (-jə-nĕt′ĭk), par′the·no·gen′ic (-jĕn′ĭk) adj.
par′the·no·ge·net′i·cal·ly adv.

parthenogenesis

[pär′thənōjen′əsis]
Etymology: Gk, parthenos, virgin, genesis, origin
a type of nonsexual reproduction in which an organism develops from an unfertilized ovum, as in many simpler animals. The development of the unfertilized ovum may be artificially induced through mechanical or chemical stimulation. Also called unicellular reproduction. parthenogenetic, parthenogenic, adj.

par·the·no·gen·e·sis

(pahr'thĕ-nō-jen'ĕ-sis)
A form of nonsexual reproduction, or agamogenesis, in which the female reproduces its kind without fecundation by the male.
[G. parthenos, virgin, + genesis, product]

parthenogenesis

The development of an unfertilized egg into an adult organism. Virgin birth. This occurs naturally in bees and ants and in some animal species development of an ovum can be induced chemically or by pricking with a fine glass fibre. The result is a clone of the mother cell identical in all respects. Only females can be produced by parthenogenesis, as no Y chromosome is present. If achieved, human parthenogenesis would make men biologically redundant. Very early human embryos derived only from ova have been produced experimentally by a parthenogenetic technique using chemicals that changed the concentration of ions in the ova.

parthenogenesis

the development of an individual from an egg without fertilization by a sperm. The process occurs mainly in lower invertebrates, particularly insects. The egg cell can be HAPLOID (1) to produce, for example, male honeybees (drones) or DIPLOID (1) as produced in wingless female aphids which, during the summer months, produce diploid eggs by MITOSIS that develop into female adults, only forming haploid gametes by MEIOSIS in the autumn prior to normal sexual reproduction.

parthenogenesis

asexual reproduction in which an egg develops without being fertilized by a spermatozoon, as in certain lower animals, especially arthropods; it may occur as a natural phenomenon or be induced by chemical or mechanical stimulation (artificial parthenogenesis).
References in periodicals archive ?
Thus, not only would the single-celled conceptus be a person, but so too the unfertilized egg which may be stimulated to develop parthenogenetically, and virtually any one of our body cells in the hands of an adept cloning biotechnician.
Larbalestier focuses on battle-of-the-sexes stories, which ran chiefly in SF magazines beginning in the 1930s and feature pretty much all the variations you would expect--worlds where men are subservient, or women procreate parthenogenetically, or indeterminate creatures morph seasonally into one or the other sex.
One would think that Shakespeare would claim sole progenitorship, as Lope parthenogenetically does in the first sonnet of his Rimas humanas:
If sperm RNA does play a role in human development, it may explain why women can't give birth parthenogenetically the way frogs and some other nonmammalian animals can, suggests Miller.
In a similar experiment, we succeeded in prompting human eggs--on their own, with no sperm to fertilize them--to develop parthenogenetically into blastocysts.
Some time ago, entomologists studying wasps and wood lice (which most of us call sow bugs) noticed that some species of these insects reproduce parthenogenetically, that is, without males (in fact without mating) and produce only (or mostly) female offspring.
In a study entitled ''Parthenogenetic Stem Cells in Nonhuman Primates,'' the ACT group says it is the first to demonstrate that stem cells from a parthenogenetically derived primate embryo are also pluripotent.
54] In the current moment, we are witnessing a Gilman publishing boom--unprecedented since Gilman's rediscovery in the 1970s--in which the parthenogenetically "pure" genealogy of feminism sketched by Gilman's first critics continues to be reproduced rather than contested.
Daphnids began releasing broods of parthenogenetically reproduced offspring on approximately day 7.
The freshwater onychopod cladoceran genus Bythotrephes longimanus (Cladocera, Cercopagidae) is native to lakes throughout the Palearetic (Berg and Garton 1994) and reproduces parthenogenetically during the summer and gametogenically during autumn (Mordukhai-Boltovskaya 1957, Ketelaars et al.
In temperate latitudes and during the reproductive period, Daphnia reproduces parthenogenetically, that is, without fertilization by a male gamete, several times.
She comes from an all-female, but parthenogenetically reproductive community who dwell in the sea.