Which of the Following Statements About X Inactivation in Mammalian

question 71

Multiple Choice

Which of the following statements about X inactivation in mammalian females is FALSE?

• A) Females that are heterozygous for an X-linked gene have patches of cells that express one allele and patches of cells that express the other.
• B) Some genes on the inactive X continue to be expressed after the chromosome is inactivated.
• C) X inactivation is random as to which X is inactivated and takes place early in embryonic development
• D) Inactivation is thought to be initiated by expression of the Xist gene on the X that will remain active.
• E) Once an X chromosome first becomes inactivated in a cell, that same X will remain inactivated in somatic cells that are descendants of this cell.

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