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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In the sense that we know which genes cause variation in this trait, yes. @asherjj74 @hbdchick
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