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 ?
4) (a) G6PDH, glucose-6-phosphate dehydrogenase; PA, parthenogenetically activated; SE, standard error; BCB, brilliant cresyl blue.
Matthiesen (1962) found in Tityus serrulatus that three individuals of the second generation, born from the first field-collected generation, parthenogenetically gave birth to the third generations when reared separately.
australasiae will continue to reproduce parthenogenetically through further generations under the present laboratory conditions, as well as in their native population of Iriomote Island, and that our separate rearing method is well suited to L.
Both subspecies reproduce parthenogenetically in variable morphs and have been described under numerous synonymic names.
Reproducing parthenogenetically in variable morphs, often much similar to rubidus, frequently identified under rubidus and variable synonyms.
Reproduces parthenogenetically in morphs often recorded under synonyms.
In vitro developmental competence (Mean [+ or -] SEM) of somatic cell nuclear transferred (SCNT) or parthenogenetically activated (PA) 2 to 4 cell and 5 to 8 cell porcine embryos cultured separately after Day 2 of in vitro culture No.
Establishment of stem cell lines from nuclear transferred and parthenogenetically activated mouse ocytes for therapeutic cloning.
To monitoring cytoplasmic maturation of the oocytes, oocytes freed from cumulus cells were activated parthenogenetically by culturing in a [Ca2.
Effect of insulin on the development of parthenogenetically activated embryos
2/30x1 electrical activation significantly increased the development ratio of parthenogenetically activated embryos.
Similar results were observed in parthenogenetically activated oocytes (Table 4).