Klinefelter's syndrome

• About 1 in 600 males have Klinefelter's syndrome
• Individuals who have this condition are biological males with male anatomy but have an additional X chromosome. 10% of cases are identified prenatally but up to 66% may not be aware of it
• Some physical effects of XXY chromosome structure are:

  • reduced body hair
  • some breast development at puberty (gynaecomastia)
  • more susceptible to health problems e.g: breast cancer
• Klinefelter's syndrome is often linked to psychological characteristics such as:

  • poorly developed language skills
  • passive, shy, and lacking interest in sexual activity
  • tend not to respond well to stressful situations
  • problems with executive functions like problem solving