Atypical sex chromosome patterns

• 2 examples of atypical sex chromosomes

  1. Klinefelter's syndrome
  2. Turner's syndrome
• Atypical sex chromosomes = variations of the sex chromosomes not the typical XX and XY chromosome pattern
• Klinefelter's syndrome = affects males in which an individual's genotype has an extra X chromosome (XXY) = makes them more feminine
• Turner's syndrome = Affects females where women have only one X chromosome rather than (XX)
• Turner's syndrome:

  1. Have broad 'shield' chest
  2. Do not have a menstrual cycle
  3. Do not develop breasts
  4. Higher than average reading ability
  5. Physically immature and tend to retain the appearance of pre-pubescent girls
• Klinefelter's syndrome characteristics:

  1. Reduced body hair compared to a 'normal' male
  2. Passive, shy and lack interest in sexual activity
  3. Does not respond well to stressful situations
  4. Underdeveloped genitals
  5. Breast development during puberty