March 1, 2003 by Willow Lawson
Danny’s struggles with learning to read may not be laziness or a lack of intelligence. Instead, an extra chromosome could be to blame.
One in 500 male babies is born with a second X chromosome—in addition to the normal XY—a condition known as XXY, or Klinefelter syndrome. The vast majority of these boys, about 80 percent, develop language-related learning disabilities and dyslexia. Speech delay, extreme shyness and small genitalia are often clues that a boy has XXY. Many also have delayed motor skills