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zygote |
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zygoteOvum (egg) after fertilization but before it undergoes cleavage to begin embryonic development. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The fertilized egg cell begins to divide and grow to become a blastocyst (ball of about 100 cells), then an embryo, and finally a fetus (unborn animal eight weeks after fertilization). Each fertilized egg cell even establishes two distinct halves, along what is called the anterior-posterior axis. For dais to happen, these cells must first join their genetic material together to form a fertilized egg cell with a totally new and unique version of the human genome. |
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