Polyembryony
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A phenomenon in which a single fertilized egg divides to produce two or more embryos. Usually, due to some accidental cause, the blastomeres of a 2- to 4-cell stage fertilized egg separate and each develops into an independent embryo. This also occurs in identical human twins. However, it is a normal phenomenon in armadillos, which always give birth to four to eight offspring of the same sex. In parasitic wasps, a type of insect, several hundred individuals can be produced from a single fertilized egg. Source : Heibonsha Encyclopedia About MyPedia Information |
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１個の受精卵が分裂して２個以上の胚が発生する現象。通常は何らかの偶発的な原因によって２〜４細胞期の受精卵の割球が分離してそれぞれ独立に胚発生を遂げたもの。ヒトの一卵性双生児もこれにあたる。しかし，アルマジロでは正常な現象で，常に４ないし８の同性の子が生まれる。昆虫のうち寄生性のある種のハチでは１個の受精卵から数百という個体を生じる。
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