The number of limbs, fingers etc. is probably quite heritable as this is related to serious genetic disorders. http://www.quillette.com/2017/03/27/a-tale-of-two-bell-curves/ …pic.twitter.com/FVbYiKayx6
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Scant testing of that in humans. One sibling control study found no effect, other weak barely significant one. @JamboJanet
Thank you for this.
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