Question

When does cell differentiation occur

Answer 1

It is When cells express different genes

Step-by-step explanation:

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Answer 2

It is to do with the genes, but stem cells can differentiate into any kind of cell; the type they become depends on environmental influences. These come from neighbouring cells, which are producing chemicals that influence the stem cell differentiation. Signals are detected through receptor molecules on the cell surface, and the activated genes direct the formation of the kinds of proteins the cell needs to specialise.