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calculate the number of barr body in female having the genotype of 2a+XXXX 1 2 3 4

calculate the number of barr body in female having the genotype of 2a+XXXX
  1. 1
  2. 2
  3. 3
  4. 4

Grade:12

3 Answers

Gaurav
askIITians Faculty 164 Points
8 years ago
Hello Student
correct answer is 3. 3
The phenomenon of inactivation of X-chromosomes was confirmed by presence of Barr Body. Whenever, the number of X- chromosomes is two or more than two. The number of barr body is one less than the number of X-chromosomes.
Tousif
13 Points
5 years ago
At a time only one x chromosome can activate in cell . So no. Of bar body = t.n. x - 1 .( t.n. _ total number of x chtomoschr) 
So correct answere is 3
DEEKSHA PARASHAR
13 Points
5 years ago
INACTIVE X CHROMOSOME IN FEMALE SOMATIC CELL IS BARR BODY. NO OF BARR BODY = NO OF X CHROMOSOME-1. SO ANSWER IS 4-1=3

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