This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Barr body is found in the following phase of the cell cycle 
Select and explain. 
A. Interphase, B. Metaphase, C. GI phase, D. Telophase
A: Interphase
Answer: A: Interphase 
Explanation: Inactivated X chromosomes seen in female somatic cells are called Barr-bodies which are present adjacent to the nuclear membrane. In humans with more than one X chromosome, the number of Barr bodies visible at interphase is always one fewer than the total number of X chromosomes.