title: Sex differences in spatial ability: the X-linked gene theory.
mesh_terms: D005260:Female; D005786:Gene Expression Regulation; D005808:Genes, Recessive; D008040:Genetic Linkage; D006801:Humans; D008297:Male; D009949:Orientation / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology; D012730:Sex Chromosomes / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D013739:Testosterone / Q000097:blood; D014960:X Chromosome / Q000502:physiology*
chemical_list: D013739:Testosterone