Somewhere around 70-80% of variance. People citing 50% as being conservative and generally ignoring measurement error and the heritability increasing with age.

Somewhere around 70-80% of variance. People citing 50% as being conservative and generally ignoring measurement error and the heritability increasing with age. The latest GCTA methods, expanding the genetics considered but still far short of all genetic effects, turn in a lower bound of ~50% ("Genomic analysis of family data reveals additional genetic effects on intelligence and personality" http://biorxiv.org/content/early/2017/02/06/106203 http://biorxiv.org/content/early/2017/02/06/106203 , Hill et al 2017; "Comparison of methods that use whole genome data to estimate the heritability and genetic architecture of complex traits" http://biorxiv.org/content/early/2017/03/10/115527 http://biorxiv.org/content/early/2017/03/10/115527 , Evans et al 2017), so the true figure is definitely going to be much higher.