most cells in a multicellular organism differentiate during development and become specialized to perform a certain task. what is the fundamental molecular mechanism that drives differentiation?

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26-10-2022
Biology

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most cells in a multicellular organism differentiate during development and become specialized to perform a certain task. what is the fundamental molecular mechanism that drives differentiation?

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qwrose qwrose · Answer 1 · 2022-10-28T10:42:33-04:00

The fundamental molecular mechanism that drives differentiation is Different cells express different genes at different times.

The different cell types in a multicellular organism differ dramatically in both structure and function. If we compare a mammalian neuron with a lymphocyte, for example, the differences are so extreme that it is difficult to imagine that the two cells contain the same genome.

For this reason, and because cell differentiation is often irreversible, biologists originally suspected that genes might be selectively lost when a cell differentiates. We now know, however, that cell differentiation generally depends on changes in gene expression rather than on any changes in the nucleotide sequence of the cell's genome.

A mammalian neuron and a lymphocyte. The long branches of this neuron from the retina enable it to receive electrical signals from many cells and carry those signals to many neighboring cells. The lymphocyte is a white blood cell involved in the immune .

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