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
Supernumerary finger count is probably close to 100% heritable. https://en.wikipedia.org/wiki/Polydactyly#Causes … @KirkegaardEmil
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Subnumenary count less so because sometimes caused by accidents, but also major genetic variation. https://en.wikipedia.org/wiki/Oligodactyly …
@KirkegaardEmil -
General rule: if something evolved, it has genetic variation, & thus heritability > 0.
@KirkegaardEmil -
Prenatal alcohol runs in families but is not genetic. Tough to know GenRul if no one does studies bc gestation too political
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There's no need to overfuse me with your interest in FAS. And surely FAS is heritable too because drinking is.
@JamboJanet -
Sorry to overfuse (?),but one cannot get FASD unless mom drinks during pregnancy. So, not heritable,but runs in families.
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Very disturbing.Scientists? I fear for this society where nonsense can rise to the top. https://videocast.nih.gov/summary.asp?live=10172&bhcp=1 …
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FAS is unlikely to be a pure genetic confound. E.g. look at animal lit. https://open.library.ubc.ca/cIRcle/collections/ubctheses/831/items/1.0094621 …
@JamboJanet@JayMan471 - 1 more reply
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