There are genes on the X chromosome that manage to escape inactivation by an as yet unknown mechanism.What particular genes are included in this group and what might be the reason that they remain activated?
A)genes that are missing from the X chromosome; they will be expressed equally in both sexes
B)genes that are also present on the Y chromosome; they will be expressed equally in both sexes
C)genes that are also found on Chromosome 1; they will be expressed equally in both sexes
D)centromere genes; so that all cells will be able to attach to the spindle
E)centromere genes; they will be expressed equally in both sexes

Question

Quizplus · Accepted Answer

The genes that manage to escape inactivation are those that are also present on the Y chromosome. This is because the Y chromosome does not undergo X inactivation and therefore these genes can remain active. The reason for this is that these genes are necessary for male development and have a dosage requirement of being expressed in both sexes, so they have evolved to escape X inactivation.

There Are Genes on the X Chromosome That Manage to Escape