Everybody knows that our genetic code makes us who we are. Today's modern technology has advanced to a point where we can clearly trace many of our physical attributes back to our genes. This genetic mapping is incredibly revealing and capable of helping us to identify with high accuracy who we are and even where we came from.
Every human being past and present has several thousand pairs of genes carried on 46 chromosomes. The genes are made of DNA, chain-like molecules, with four different units called A, C, T and G.
Each gene is a specific stretch of DNA, where the sequence of these units in the gene is the genetic information. The total sequence of DNA in a cell, about six billion units, is called the human genome.
This sequence differs slightly from person to person – some of these variations cause us to be different from each other, for example in blood group, skin colour or eye colour. However, the old saying that "Our destiny is dictated by our genes" is in part misleading. Today Epigenetics powerfully demonstrates that our genetic code it is not a dead sentence!