Four hypotheses with a dearth of data: response to Lehrke's "A Theory of X-Linkage of Major Intellectual Traits".
D002648:Child; D005260:Female; D005796:Genes; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007360:Intelligence; D008297:Male; D008962:Models, Theoretical; D011582:Psychological Theory; D012730:Sex Chromosomes; D012737:Sex Factors; D013223:Statistics as Topic