Barr body is absent in female having: (A) 46 XX genome, (B) 45 X0 genome, (C) 47 XXX, (D) All of the above
Answer is B. Barr body is absent in those with genotype 45 XO . For a brr body to be present a minimum of 2 x chromosomes should be there . No of Barr body = no of x chromosomes - 1. Reference: GHAI Essential pediatrics, 8th edition