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 ?
amp;nbsp;"It will be essential to prevent the spread of the females as there are cockroaches that can expand their habitat range through parthenogenesis," the research team said.
The left column represents the sexual reproduction and the right column represents the parthenogenesis of M.
Destabilizing hybridization, general-purpose genotypes and geographic parthenogenesis.
We have approximately six years of waiting before we find out whether Zebedee's offspring will reproduce exclusively through parthenogenesis, or would mate with a male if the opportunity arose, or would be able to alternate between the two styles of reproduction.
Data presented here, along with absence of a unique paternal allele in the offspring and known absence of an opportunity to mate prior to and during captivity, is consistent with and expected for reproduction by parthenogenesis in this usually bisexual species.
Hallmark Family Species Acarina Parthenogenesis Argasidae Ornithodorus spp.
Artificial parthenogenesis in starfish eggs: production of parthenogenetic development through suppression of polar body formation by methylxanthines.
Viable young can also result from parthenogenesis in various species of reptiles, plants, insects, fish, and birds.
The researchers, from Queen's University Belfast, the Guy Harvey Research Institute at Nova Southeastern University in Florida, and Henry Doorly Zoo in Nebraska, found evidence that sharks can reproduce asexually by the unusual parthenogenesis method.
Surely, there are alternative mechanisms, including sexual evolution via repairing mechanisms of DNA (Cavalier-Smith, 2002) or evolutionary bottlenecks resulting from parthenogenesis (Moritz, 1993; Kearney et al.
Paternity tests carried out by scientists at the University of Liverpool proved that Flora was both the mother and the father of the fertile eggs, a system of reproduction known as parthenogenesis.
They used a method called parthenogenesis, found in some insects and reptiles, that does not require sperm or male chromosomes.