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How did evolution resolve serial mitosis problem

From zygote, the pluricellular organisms are made by serial mitosis. Would this formation be probable when each cell made up by mitosis had a similar life in relation to its precursor cells? How did evolution resolve that trouble?

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The making of complex and different pluricellular organisms would not be probable when mitosis in embryos generated only daughter cells with a similar life history as the mother cell, as there would not be differentiation and functional or structural specialization among cells.

Evolution resolved the trouble making the cellular differentiation procedure by which, motivated by stimulus not yet famous by science, distinct and specialized cell lineages gave birth to various tissues, organs and systems that, as an entire, make the pluricellular organisms.

Cellular differentiation most likely is a very intricate process which activates and inactivates various genes within the cell in response to certain stimulus.

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