An international research team headed by Vera Kalscheuer, Max Planck Institute for Molecular Genetics in Berlin has analysed 405 families, in which cases of X-linked intellectual disability occur. Defective genes on the X chromosome cause X-linked intellectual disability. The disease is passed on in a recessive manner in men, as they possess only one X chromosome. Women are affected only if both their X chromosomes carry the defective genes. Women ...
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