One X and four hypotheses: response to Lehrke's "A Theory of X-Linkage of Major Intellectual Traits.
D002648:Child; D005260:Female; D005796:Genes; D005808:Genes, Recessive; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007360:Intelligence; D007859:Learning Disabilities / Q000235:genetics; D008297:Male; D008962:Models, Theoretical; D011582:Psychological Theory; D012730:Sex Chromosomes; D012737:Sex Factors