polyembryony


Also found in: Dictionary, Encyclopedia, Wikipedia.
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.
Mentioned in ?
References in periodicals archive ?
In some species, polyembryony is an obligate part of development.
Polyembryony with successful development of only one embryo seems the only alternative.
These data are starting points in evaluating the impact of monozygotic polyembryony on armadillo behavior and social structure.
This array of pleiotropic effects at the level of the female gametophyte gives rise to polyembryony and elevated ploidy levels of the endosperm after fertilization, derived from fertilization by different pollen tubes, together with miniature endosperms, early abortion of seeds and the occurrence of androgenic and gynogenic haploids in a 2:1 ratio (Kermicle, 1969, 1971, 1994; Lin, 1984).
Microscalc genetic differentiation in a sessile invertebrate with cloned larvae: investigating the role of polyembryony.
In most of them occurred in vivo zygotic polyembryony, although some individual hybrids were also formed.
Secondary somatic embryogenesis or polyembryony was also common (Fig.
Molecular documentation of polyembryony and the micro-spatial dispersion of clonal sibships in the nine-banded armadillo, Dasypus novemcinctus.