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Apparently some humans are born with two spleens. What evolutionary pressures likely created the trait, and what future pressures could drive second spleens to become more common? (lemmy.world)

submitted 11 months ago by JoshuaSlowpoke777@lemmy.world to c/nostupidquestions@lemmy.ca

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[–] CrayonRosary@lemmy.world 6 points 11 months ago* (last edited 11 months ago)

A second spleen is probably just a developmental defect and not genetic in any way.

Also, that's not how evolution works. "Evolutionary pressure" doesn't cause spontaneous gene changes to appear. Genes naturally drift and mutate, and then selection pressures might eventually favor one set of genes over another.