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 ?
Can facultative parthenogenesis occur in biparental mealybug species?
The small genetic distance between the Vanern and Paajarvi populations suggests that parthenogenesis in C.
(organisms resulting from parthenogenesis) do not have the inherent
The CJEU agreed with A-G Cruz Villalon's Opinion that in order to be classified as a 'human embryo,' a non-fertilised human ovum "must necessarily have the inherent capacity of developing into a human being." Therefore, if an unfertilised human ovum whose division and further development have been stimulated by parthenogenesis did not, in itself, have the inherent capacity of developing into a human being, it would not constitute a 'human embryo' under the Directive.
However, there were significant differences in fecundity (sexual reproduction: F = 21.438, df = 3, 102, P < 0.001; parthenogenesis: F = 37.709, df = 3, 104, P < 0.001) among the 4 leguminous plants tested (Table 3).
Mr O'Shea said: "What had occurred is known to scientists as parthenogenesis - literally Greek for 'virgin birth.' This appears to be first time the process has been documented for anacondas."
Claviceps purpurea, Mus rattus, parthenogenesis and Lamarckism have been misspelt in the text and names too suffer (Jokichi Takamine, Georges Cuvier, even Brown-Sequard).
Turkeys can have offspring without having sex thanks to a form of reproduction called parthenogenesis. While chickens need to have their eggs fertilised in order to have a chick, female turkeys can do it all themselves.
into, the water thick with primordial cells, parthenogenesis producing
Other researchers have suggested that species reproducing by parthenogenesis can increase their population sizes more rapidly than can bisexual counterparts because they do not waste reproductive effort on producing males (e.g., Wright and Lowe, 1968).
Parthenogenesis is a form of asexual reproduction, during which unfertilized eggs begin to develop as if they had been fertilized.