Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: May 5th, 2025

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The two cell stage occurs with the first cleavage of the zygote. About twenty-four hours after fertilization and the subsequent formation of the zygote, the zygote divides and gives rise to two daughter cells.

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