Learning problems are genetic
  By Steve Connor, Science Editor
  10 September 2003

  Children who are poor at reading are not disabled but responding to genetic
  influences, a psychologist told the conference.

  Professor Robert Plomin of King's College London studied 7,500 sets of
  identical and non-identical twins since 1998 and concluded that if one
  identical twin suffered a learning disability, there was a 72 per cent chance of
  the other twin -- who shares the same genes -- suffering the same disability,
  compared with a 45 per cent chance in non-identical twins. He said: "These
  findings suggest that there are no disabilities, just extreme variations of
  ability within a normal distribution."

http://news.independent.co.uk/uk/this_britain/story.jsp?story=441922


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