He is likely right, because genes for intelligence are very often on the X-chromosome: https://www.psychologytoday.com/articles/201109/the-incredible-expanding

He is likely right, because genes for intelligence are very often on the X-chromosome: https://www.psychologytoday.com/articles/201109/the-incredible-expanding-adventures-the-x-chromosome https://www.psychologytoday.com/articles/201109/the-incredib...