One day, some humans may have wings and fly in the air and other have gills and swim in the sea. This will be by means of gene-editing, a technque that has only been developed in the last ten years. By this method a gene in your DNA might be identified and neatly extracted, or modified. Perhaps also, a gene new to your DNA can be added. When will flying or swimming humans be possible? Who knows? At present it certainly seems like hundreds of years away.
In the meantime, gene-editing will be used to delete or modify harmful recessive genes that gives you or your children an illness — or a propensity to it. Thousands of such genetic diseases have already been identified with varying frequencies in the form of single copies in individuals ranging from 1 in 20 to 1 in 100,000. Such single copies are carried but don’t physically express themselves, only when they match up with an identical one in the other set of DNA contributed by the mother or father of the individual.
How accessible will gene-editing become? Its benefits are so great that it will become rationed just as — if not very much more so — is already happening with present-day medical treatments. Just as aspiration for personal status incentivised the industrial revolution so will aspiration for personal good healtth incentivise the biological revolution.