The heritability of intelligence is noted by Plomin and von Stumm (2018) to be about 50% based on previous studies, particularly those looking at twins. When specifically looking at SNPs the heritability of intelligence is stated to be around 25%, whereas GPS heritability is stated to be about 10% (Plomin and von Stumm, 2018). It is suggested by Plomin and von Stumm (2018) that the discrepancy between the heritability values for SNPs and GPS could be ameliorated through increasing the GWAS sample size as well as looking at the interaction between genes and the environment amongst other considerations.
It is also noted by Plomin and von Stumm (2018) that this particular area of research has many ethical, legal, and social considerations. Particularly the issues associated with stigmatisation, as seen in the misuse of IQ data in the 1900’s as a way of separating out individuals, as well as the potential use of biological determinism (Plomin and von Stumm, 2018).
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Third post from Nature Reviews Genetics.
Plomin, R., and von Stumm, S., 2018. The new genetics of intelligence. Nature Reviews Genetics. 19: 148-159.