If all the tissues are the descendants of zygote then why they have different structural and functional attributes
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The genome of the zygote is inherited by all cells that are subsequently produced by division during the course of development. But cells go on to differentiate and become highly specialized, especially with respect to the genes that they activate. So, if all cells are "programmed" with the same genetic instructions, how and why do cells produce only the proteins needed for their degree of specialization and not those which are not
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