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.

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.
References in periodicals archive ?
We further analyzed the effects of LPS on the parthenogenetic development of bovine oocytes.
For different types of invertebrate animals, a parthenogenetic life style serves as an adaptation to unfavorable environmental conditions (Clark and Bowen 1976; Glesener and Tilman 1978; Grebelnyi 1996; Hebert and Finston 2001; Hebert et al.
Yan et al., "Directing the differentiation of parthenogenetic stem cells into tenocytes for tissue-engineered tendon regeneration," Stem Cells Translational Medicine, vol.
General has made it clear that parthenogenetic organisms can be excluded
Alternative ontogenetic pathways to color pattern class B in a newly discovered population of parthenogenetic Aspidoscelis neotesselata (Squamata: Teiidae).
bidentatus have a lifespan of five days (mean [+ or -] one SD = 4.69 [+ or -] 0.48; N = 13), and produce 4.5 [+ or -] 3.67 (N = 6) parthenogenetic eggs during such lifespan.
The differences between bisexual and parthenogenetic RWW in terms of the morphology of antennae have not been determined.
Aspidoscelis neotesselata is a parthenogenetic species that originated as the result of hybridization between a diploid unisexual Common Checkered Whiptail (Aspidoscelis tesselata), and a diploid sexual species, Six-lined Racerunner (A.
As he had done when a new and plausible model for the origin of the parthenogenetic Warramaba virgo was proposed (Hewitt 1975), he would have started a series of new experiments and then change his view accordingly if the results so indicated.