Question 1
Mammalian X inactivation is a result of Xist, which is:
◦ a protein.
◦ an RNA molecule.
◦ a DNA molecule.
◦ a ribonucleoprotein.
◦ a DNA-RNA hybrid.
Question 2
Methylation of an imprinting control region that is between two genes:
◦ must activate both genes.
◦ may activate one gene and inactivate the other.
◦ must inactivate both genes.
◦ must always activate only one of them.
◦ must always inactivate only one of them.