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 ?
The left column represents the sexual reproduction and the right column represents the parthenogenesis of M.
Working closely with Dr Khazanehdari of the Central Veterinary Research Laboratory, we have confirmed that parthenogenesis took place through the DNA analysis of Zebedee's offspring.
Production of offspring in the absence of males: evidence for facultative parthenogenesis in bisexual snakes.
Hallmark Family Species Acarina Parthenogenesis Argasidae Ornithodorus spp.
Mammals normally can't reproduce by parthenogenesis, but that very fact is making the process interesting in a different way: It suggests a possible solution to the moral issues surrounding embryonic stem cell research.
The genetics of parthenogenesis in lizards means that all her hatchlings would have to be male.
Successful parthenogenesis in mammals had been regarded as impossible because the embryos always failed to develop.
Finally, there is the question whether the reproduction of the two triploid Corbicula species involves self-fertilization, cross-fertilization, or parthenogenesis.
The hypothesis includes: 1) cell to cell injury performed through boundary trespassing, displayed during the different morphogenetic stages along the embryo formation; 2) the "injuring" inductive interactions of different cellular systems composed by large groups of cells with a strong cross-talk relationship, as shown by the action of specific cell groups--as the ones in the endodermal and mesodermal organizer centers-, on the surrounding cells; 3) physical and chemical "injuring" inductive phenomena such as parthenogenesis and modeling events in the embryo/post-embryo development; 4) field topography disruption resulting from interphases produced by large cellular injury.
Parthenogenesis occurs naturally in numerous animal species, including some mammals.
scientists has successfully derived stem cells that can differentiate into many cell types from monkey embryos created with parthenogenesis technology, in which eggs develop into embryos without fertilization, according to a study published in the U.
The embryos that result from this process, known as parthenogenesis, cannot develop into babies since they lack the genes from a male that are needed to form a placenta.