gynogenesis


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gynogenesis

 [gi″no-] , [jin″o-jen´ĕ-sis]
development of an egg that is stimulated by a sperm in the absence of any participation of the sperm nucleus.

gy·no·gen·e·sis

(gī'nō-jen'ĕ-sis, jin-ō-),
Oocyte development activated by a sperm, but to which the male gamete contributes no genetic material.
[gyno- + G. genesis, production]

gynogenesis

(gī′nə-jĕn′ĭ-sĭs, jĭn′ə-)
n.
Parthenogenesis in which the egg is activated by sperm, but without fusion of the egg and sperm nuclei.

gy′no·ge·net′ic (-jə-nĕt′ĭk) adj.

gy·no·gen·e·sis

(gī'nō-jen'ĕ-sis)
Oocyte development activated by a sperm, but to which the male gamete contributes no genetic material.
[gyno- + G. genesis, production]

gynogenesis

the parthenogenetic development of an egg after the egg membranes have been penetrated by a male gamete. There is no nuclear fusion and stimulation of development might be purely mechanical.
References in periodicals archive ?
In molluscs, studies on gynogenesis were preliminary, and the progress was slow.
Among vertebrates gynogenesis occurs only in some allfemale species of fish, salamanders, and lizards [5].
In the gynogenesis study, motility of spermatozoa over 90% has been used in fertilization.
Nonetheless, in both intra- and interspecies variants of the gynogenesis, DH brown trout larvae hatched and survived till the swim-up stage (Table 1).
Gynogenesis in the African catfish Clarias gariepinus.
The objective of this study was to examine the effects of several factors affecting in vitro gynogenesis including genotypes of donor plants, induction and differentiation media, and thermal shock pretreatment on ELS and callus formation in the unpollinated ovary culture of five cucumber cultivars in Thailand that are productive and/or moderately resistant or resistant to downy mildew (Pseudoperonospora cubensis).
1990.--Ploidy manipulation and gynogenesis in fishes: Cytogenetic and fisheries applications.
Some of these factors, which may also be present in other types of haploid-inducing techniques (gynogenesis through interspecific or intergeneric hybridization) are not present in most of the reported cases of in vivo androgenesis.
Production of inbred lines using traditional systems takes a long time, while gynogenesis offers the possibility of haploid and dihaploid lines production in a shorter time.
The triploid forms that reproduce by gynogenesis have 141 to 160 (3n) chromosomes (Penaz et al., 1979).
The 27 papers in the 2005 edition of the annual volume review recent studies on the evolution of fluctuating asymmetry, polyandry, aphid- ant interactions, and agriculture in insects; and the evolutionary ecology of gynogenesis and plant adaptation to serpentine.
tigrinum) can form female triploid hybrids that reproduce via gynogenesis (Bogart & Licht 1986).