What is the result of the activation of the XIST gene in mammals?
A)the inactivation of one of the X chromosomes,which then becomes a Barr body in females
B)activation of the SRY gene that results in the development of male sexual characteristics
C)the activation of genes on both X chromosomes in females
D)the expression of sex-linked traits in males

Question

Quizplus · Accepted Answer

The activation of the XIST gene in mammals leads to the inactivation of one of the X chromosomes in females, which then becomes a Barr body. This ensures that there is an equal dosage of X-linked genes in males and females, as males only have one X chromosome. The inactivated X chromosome remains condensed and silent throughout the lifetime of the cell and its progeny.

What Is the Result of the Activation of the XIST