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A question on genetics and biology

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shvarz:
What they probably meant in that program is that most genes in animals remain the same, but evolution mostly happens by changing the way these genes are regulated (which involves relatively small regions of DNA). So that two animals may look quite different, but most of their proteins are very closely related. The difference originates from the way proteins and higher level structures are assembled. Obviously bacteria, being very simple organisms, don't need these complex regulatory pathways (only multicellular organisms do).

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