13. What is the relationship between methylation and genomic imprinting?
(A) Differential methylation of DNA in males and females results in only one of the parental alleles being transcriptionally active in the offspring.
(B) Reversible methylation of DNA inherited from the father results in the paternal alleles being
(C) expressed only late in development. Reversible methylation of DNA inherited from the mother results in the maternal alleles being expressed only late in development.
(D) DNA methylation silences the alleles inherited from both parents, so no alleles are transcriptionally active.
(E) DNA methylation does not regulate gene expression.