Human cloning. Conceptual computer artwork of identical babies and genetic sequences (white bands), representing human cloning. A human clone is a person whose genetic material, or DNA (deoxyribonucleic acid), is identical to that of another human being. Human cloning is theoretically capable of producing a limitless number of genetically-identical people, by replacing DNA present in a human egg with adult DNA and allowing the egg to develop. DNA is made up of chemical units called nucleotides. The sequence of nucleotides along a DNA molecule makes up an individual's genetic code.