So too with poo. A poo can take on a variety of appearances and still be considered normal. It can be all manner of shades â from orangey and dark brown to magenta or green from certain veggies or blue from artificially-colored foods and beverages.
Epigenetics is the study of changes in gene activity which are not caused by changes in the DNA sequence. It is the study of gene expression, the way genes bring about their phenotypic effects. These changes in gene activity may stay for the remainder of the cell's life and may also last for many generations of cells, through cell divisions.
Epigenetics literally means above or on top of genetics. It refers to external modifications to DNA that turn genes on or off.. These modifications do not change the DNA sequence, but instead, they affect how cells read genes. Examples of epigenetics.Epigenetic changes alter the physical structure of DNA.One example of an epigenetic change is DNA methylation â the addition of a methyl group, or a chemical cap, to part of the DNA molecule, which prevents certain genes from being expressed. Another example is histone modification.Histones are proteins that DNA wraps around.ne example of an epigenetic change is DNA methylation â the addition of a methyl group, or a chemical cap, to part of the DNA molecule, which prevents certain genes from being expressed. Another example is histone modification.