What Evidence Suggests That While the XIST Gene May Be

Multiple Choice

What evidence suggests that while the XIST gene may be required to initiate X chromosome inactivation, it may not be required to maintain it from one generation to another?

A) Tumor cells do not maintain X chromosome inactivation from generation to generation.
B) Some tumor cells in women contain inactivated X chromosomes whose XIST gene has been deleted.
C) Some tumor cells in women contain inactivated X chromosomes whose XIST gene has been duplicated.
D) Some women have patches of cells in their retinas that are color blind and others that are not.
E) Some tumor cells in women have no X chromosomes.