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

garima nirmal , 11 Years ago
Grade 12
anser 3 Answers
Gaurav
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.
Last Activity: 11 Years ago
Tousif
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
Last Activity: 7 Years ago
DEEKSHA PARASHAR
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
Last Activity: 7 Years ago
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