原肠胚形成的原因和原因

J.M.W. Slack
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引用次数: 3

摘要

原肠形成被定义为介于囊胚阶段和种型(动物型)发育阶段之间的形态发生运动阶段。发生原肠胚形成是普遍的动物经历胚胎发育从卵,但有相当大的不同类型的运动观察。原肠胚形成也是第一个非常重要的发育承诺建立的阶段,特别是那些与经典的“胚层”相对应的阶段。从进化的观点来看,动物的发展分为三个阶段,第一阶段和最后阶段是可变的,中间阶段,即种型阶段,是最保守的。原肠胚形成属于发育的早期阶段,它本身是可变的,因为它受到生殖行为和生活史上的选择力量的影响,主要是那些控制卵的数量和大小的力量,以及胚胎营养的手段。
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The whys and wherefores of gastrulation

Gastrulation is defined as the phase of morphogenetic movements lying between the blastula stage and the phylotypic (zootype) stage of development. The occurrence of gastrulation is universal among animals undergoing embryonic development from eggs, but there is considerable diversity in the types of movement observed. Gastrulation is also the stage at which the first very important developmental commitments are established, in particular those corresponding to the classical 'germ layers'. From an evolutionary point of view, animal development falls into three phases of which the first and last are variable and the middle, phylotypic, phase is most conservative. Gastrulation belongs to the early phase of development which is inherently variable because it is subject to selective forces operating on reproductive behaviour and life history, principally those controlling the number and size of eggs, and the means for embryonic nutrition.

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