Abstract
The male female difference in the variance of quantitative traits including IQ can be accounted for by the observation of the concentration of genes involved in brain development on the X chromosome and by the mechanism of sex determination in mammals. Females have two X chromosomes with one randomly inactivated. Males have a single X chromosome, which results in increased variance. It is shown that these factors are sufficient to account for the observed differences.
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Strauss, B., Strauss, J. Why are Male IQ Scores More Variable?. Nat Prec (2009). https://doi.org/10.1038/npre.2009.3238.1
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DOI: https://doi.org/10.1038/npre.2009.3238.1