Q.Klinefelters' syndrome is characterized by a karyotype of

Step 1. Recall that Klinefelter's syndrome results from the presence of an additional X chromosome in a male, giving 44 autosomes + XXY (47 chromosomes total, karyotype 47,XXY).

Step 2. Eliminate the other karyotypes: XYY is a different (not covered in this chapter) sex-chromosome condition; XO is Turner's syndrome (loss of an X, in females); XXX ('super female') is …

Recall the defining karyotype of Klinefelter's syndrome (47,XXY) and eliminate the ot …

• Confusing Klinefelter's syndrome (XXY, male) with Turner's syndrome (XO, female) — both involve sex-chr …