TOLPA STUDIOS, INC. Epigenetic events regulate the activities of genes without changing the DNA sequence. Different genes are expressed depending on the methyl-marks attached to DNA itself and by changes in the structure and/or composition of chromatin. The main components of chromatin are histones (in bundles of eight units) around which 146 base-pairs of DNA are wound like a thread around a spool, forming a structure called the nucleosome. There are various epigenetic mecha
How many human genes are there? How long is our DNA? How much of your DNA is the same as the person sitting next to you? Since scholars began studying modern genetics in the mid-19th century, they've made some astounding discoveries about genes and inheritance—and every day they're learning more.