Gene dosage is an important issue both in cell and evolutionary biology. Most genes are present in two copies or alleles in diploid eukariotic cells. The most outstanding exception is monoallelic gene expression (MA) that concerns genes localized on the X chromosome or in regions undergoing parental imprinting in eutherians. and many other genes scattered throughout the genome. https://hollandscountryclothinges.shop/product-category/saddle-pad-bags/