Paper I
Question
The typical karyotype of Turner syndrome is
Answer
Correct answer: a) 45, XO
Turner syndrome results from complete or partial monosomy of the X chromosome, with the classic karyotype being 45,X (45,XO) — a single X chromosome with no second sex chromosome. (47,XXY is Klinefelter syndrome; 47,XYY is a different, generally mild disorder in males.)