polyembryony


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Related to polyembryony: apomixis

pol·y·em·bry·o·ny

(pol'ē-em-brē'ō-nē),
Condition of a zygote's giving rise to two or more embryos.
[poly- + G. embryon, embryo]

polyembryony

/poly·em·bry·o·ny/ (-em-bri´o-ne) the production of two or more embryos from the same oocyte or seed.

polyembryony

(pŏl′ē-ĕm′brē-ə-nē, -ĕm-brī′-)
n.
Development of more than one embryo from a single egg or ovule.

pol′y·em′bry·on′ic (-brē-ŏn′ĭk) adj.

polyembryony

  1. (in plants) the formation of more than one embryo within the TESTA of a seed.
  2. (in animals) the development of more than one embryo from a single egg as occurs, for example, in certain parasitic HYMENOPTERA which use this phenomenon to increase rapidly the numbers of juveniles within the host.

polyembryony

the production of two or more embryos from one ovum, e.g. monozygotic twins. Armadillos are the only consistently polyembryonic mammals.
It is a phenomenon in some helminths, e.g. Gyrodactylus spp., in which viviparous adults produce trematodes that are identical with themselves and as larvae they carry larvae within their uteri which contain larvae in their uteri. The rate of reproduction can be very high. Also occurs in some insects in which fertilized eggs give rise to a number of larvae.
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References in periodicals archive ?
Polyembryony with successful development of only one embryo seems the only alternative.
exists in 53 families; polyembryony appears in 115 families and 255
The possibility that the occurrence of polyembryony may regularly
through 1999 showed polyembryony in 14 hermaphroditic and dioecious
Torreya is unique in the Taxaceae in having embryogenesis with cleavage rather than simple polyembryony and a cell wall formed at the 4 or 8 nuclei stage (Doyle & Brennan, 1971; Tang et al.
Cleavage polyembryony in conifers and taxads - A survey.