eli5: what causes genes from generations past our grandparents to be expressed back again?
In: Biology
Randomness. Majority of the genes expressing themselves are the same genes first multicellular animals had (and still have); humans synthesize proteins in pretty much the same way as rabbits, birds, snails etc. Some of the genes you think about when you mention “genetations past grandparents” I suspect are things like eye colour etc. These are such a minor part of your genome, and coded by a couple of genes that random luck when they recombine will cause them to create a train that you might not have expected.
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