Genome. All members of the same species shared over 99.9 of their genome. People who were blood related had an extremely high similarity in their genome. The similarities among human genomes made up the characteristics of a human such as the body, the mind, intelligence, etc. The minute difference that were less than 0.1 percent made up the facial features, personalities, blood types, etc.
Of course, many of the genes in a human were never activated in a person’s life. These genes were remnants of evolution. Evolution of single-celled life, multicellular life, amphibians… and finally man. Many of the genes from the ancient eons were left in our genome. However, what natural selection did not choose to retain weren’t necessarily bad genes. Sometimes, the good genes were eliminated first.
If a person gained full control of his DNA, these hibernating genes would be awakened along with the strength hidden within, and similarly, the primitive instincts of killing.
