regardless of how many X chromosomes a somatic cell possesses, all but one of them are inactivated.
how many Barr bodies in Turner's, Klinefelters or 47, XXX?
- N-1 rule, N=#of chromosomes...
- no Barr bodies in Turner's (XO)
- 1 Barr body in Klinefelter's (XXY)
- 2 Barr bodies in 47, XXX