<prompt> True about Lyonisation of X chromosome:Inactivation of X chromosome only in somatic cellInactivation of X chromosome only in germ cellInactivation of X chromosome in somatic germ cell bothMaximun number of Barr body is equal to X chromosome  <response>: Answer- A. Inactivation of X chromosome only in somatic cellIn female, one of two X-chromosome either paternal or maternal is inactivated during embryogenesis as stated in Lyon hypothesis.This inactivation is passed to all the somatic cell while the germ cells in the female remain unaffected. 