(Solved): Which X chromosome is inactivated in female mammals, the maternal X or the paternal X ? Both X chro ...

Which $\mathrm{X}$ chromosome is inactivated in female mammals, the maternal $\mathrm{X}$ or the paternal $\mathrm{X}$ ? Both $\mathrm{X}$ chromosomes in some cells, neither in others Only the maternal $\mathrm{X}$ chromosome Only the paternal $\mathrm{X}$ chromosome The maternal X chromosome in some cells and the paternal X chromosome in others.