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Originally Posted by downquark1
It depends in which cells and at what stage of development.
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It's not likely that the kidney cells mutated during development in the womb for both brothers.
More likely that the genes that produce the "make a kidney" protein are doubled up.
Genes don't really work in the "this gene makes a liver" way.
Take eye colour, I have the genes which when read produce a chemical which my iris reacts to and turns blue, but the genes aren't "blue eyes" genes, they're "chemical that turns eyes blue" genes, and in iris, the "react to chemical that turns iris blue" genes are active.