AIIMS 2001 Botany Sexual Differentiation in Mammals MCQ Question

A Barr Body is an inactivated X chromosome found in the cells of female mammals. During interphase, the cell is not dividing, and the Barr Body can be observed in the cytoplasm as a result of X-inactivation, which occurs to balance the dosage of X-linked genes between males (XY) and females (XX). In males, since there is only one X chromosome, Barr Bodies are not present. Therefore, option A is correct. Options B, C, and D are incorrect because: B) Males do not have Barr Bodies; C) During the mitotic phase, Barr Bodies are not typically visible as they condense into chromosomes; D) Similarly, males do not exhibit Barr Bodies during any phase of the cell cycle.