In a small subset of mammalian genes, one of many two inherited copies (alleles) is switched off. Which allele is matter to “genomic imprinting” is dependent on whether or not it was inherited from the mother or the father. Genomic imprinting can be a developmentally identified epigenetic course of action https://stampedconcrete58876.blogtov.com/9767570/pattern-driveways-fundamentals-explained