試題詳解

47. Which of the following is NOT true of the imprinting of the mammalian gene for insulin growth factor-2 (IGF-2)?
(A) CTCF binds to the methylated IGF2 gene insulator.
(B) IGF2 gene is activated when the insulator is methylated.
(C) The maternally inherited copy of IGF2 is normally repressed in egg cells.
(D) The insulator of both the paternal and maternal IGF2 alleles lies between the promoter and the enhancer.