androgenesis


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Related to androgenesis: angiogenesis, gynogenesis

androgenesis

 [an″dro-jen´ĕ-sis]
a phenomenon in which an ovum is fertilized by a haploid sperm, which then duplicates its own chromosomes after meiosis; the chromosomes of the ovum are either absent or inactivated. This is often associated with complete molar pregnancies.

an·dro·gen·e·sis

(an'drō-jen'ĕ-sis),
Development in the presence of paternal chromosomes only.
[andro- + G. genesis, production]

androgenesis

/an·dro·gen·e·sis/ (an″dro-jen´ĕ-sis) development of a zygote that contains only paternal chromosomes, as after fertilization of an oocyte whose chromosomes are absent or inactivated.

androgenesis

(ăn′drō-jĕn′ĭ-sĭs)
n.
The development of an embryo that contains chromosomes from only the male parent.

an·dro·ge·net·ic (ăn′drō-jə-nĕt′ĭk) adj.

an·dro·gen·e·sis

(an'drō-jen'ĕ-sis)
Development in the presence of paternal chromosomes only.
[andro- + G. genesis, production]

androgenesis

the development of male secondary sexual characteristics.
References in periodicals archive ?
Paschos I, Natsis L, Nathanailides C, Kagalou I, Kolettas E (2001) Induction of gynogenesis and androgenesis in Goldfish.
Petals were removed aseptically and anthers were carefully excised with forceps and placed on MS (Murashige and Skoog 1962) media modified with different auxins and cytokinin either alone or in combination for androgenesis called as MSA media (Table 1).
The term androgenesis was initially confined to a male-specific form of parthenogenesis by which an embryo is believed to originate from a fertilized egg where the female nucleus is somehow inactivated or eliminated (Fig.
Nonetheless, some breeding data suggest the occurrence of androgenesis in Poecilia formosa.
Doubled haploid sunflower (Helianthus annuus) plant production by androgenesis : fact or artifact.
Of all published studies on androgenesis in interspecific and intergeneric hybrids of grasses, only one reported on successful regeneration of haploid green plants in L.
For example, in fish, gynogenesis, androgenesis, or karyogamy may result from heterospecific insemination (Chevassus 1983).
Androgenesis type are influenced by factors such as genotype[3,4,6,8,10,17], pollen grain development of stage[2,3,6,8,9,13,18,19], medium composition [3,4,8,17], rate of growth regulators [3,4], illumination regimes[3,5,6] and physiological state of mother plant[6].
After GUHA & MAHESHAWARI (1966) discovered in vitro androgenesis in cultured anthers of Datura innoxia, it become possible, in responsive crops, to obtain, in one step, fully homozygous lines, saving time and resources in breeding programs.
In vitro, following androgenesis, plastids that originate in the microspore are responsible for the occurrence of albino plantlets in Poaceae.
This variation is common in androgenesis in durum wheat and is a major problem for the application of haplodiploidisation in breeding programs of this species (Ghaemi and Sarrafi, 1994).
ANDROGENESIS, the process by which pseudoembryos (embryoids) able to germinate into plants are produced from microspores (pollen embryogenesis), is of significant interest for developmental and genetic research as well as for plant breeding and biotechnology, since the process is a means for producing genetically true-breeding, doubled-haploid (DH) plants.