Gastrula

... a kidney or any cell for that matter because they know it from their parent cell. But when we start from the zygote,and cells go through morula ,gastrula,blastula stages,and the three germ layers,how does the cell know at that time which genes to activate in order to make a given cell a neuron,cardiac ...

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zygote, blastula, morula, gastrula, embryo gametogenesis fertilization blastulation gastrulation neurulation= only in Chordates organogenesis Hope this helps.

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Maybe zygot - morulla - blastula - gastrula - neurula things? :?

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... answer the original questions: Humans do not go through alternation of generations. Very few groups of animals do. We do go through blastula & gastrula, but not in the classic "ball" shape (most vertebrate blastulas are really a hollow disc, sitting on a yolk).

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... happens in moss and fern's "metagenesis"... Well I don't think so :? @Amrik: Why do you put "women" in brackets? Blastula and gastrula are common in human, even all animals development :?

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