True abut 'X' Chromosome inactivation:: (A) X gene, (B) RNA interference, (C) Seen in Male, (D) All
Answer is A. A i.e. X-gene Although females have 2X chromosomes (XX), but due to inactivation (lyonization) genes on one X chromosome becomes transcriptionally inactive. Thus X inactivation prevents expression of most genes on one of the X- chromosome in every cell of femaleQ.