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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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SamTheEmbryoMan SamTheEmbryoMan
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4 years ago
If all of the cells divide from the same zygote it seems like they should all be the same. What causes one part of the clump of cells in a blastula to start folding over to form the mesoderm and endoderm in the animal cleavage cycle?

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4 years ago
They are all the same genetically speaking, that is, they all have the same genes. What differentiates the cells is what happens early on the development of the organism. Genes get turned on-and-off based on what they're determined to become. This is referred to as epigenetics. By methylating genes, they can no longer be accessible to proteins found in the tissue they're specialized in becoming.
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duddyduddy
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4 years ago Edited: 4 years ago, duddy
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