Atypical sex chromosome patterns: Klinefelter's syndrome and Turner's syndrome
Sometimes people are born with an unusual number of sex chromosomes. Klinefelter's syndrome (XXY) affects males, and Turner's syndrome (XO) affects females — both alter typical biological development.
Real World
Swimmer Casey Legler, assigned female at birth and later diagnosed with Turner's syndrome, has spoken publicly about how atypical development shaped both physical attributes and gender identity.
Exam Focus
State the chromosome pattern (e.g. XXY, XO) before listing features — examiners expect precise notation, not just the syndrome name.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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