SNEERING at people’s DNA isn’t allowed any more. If you refuse someone a job on the basis that their ancestors happened to live in places where dark skin is a useful adaptation to strong sunlight, you will, in civilised countries, be in trouble. We don’t enslave people on the grounds of their genetic inheritance, make them sit at the back of the bus, or refuse them entry to golf clubs. Such attitudes are, properly, deemed repellent.
Yet there is still one sort of genetic discrimination that is not only legal, it is universally applied and wholly respectable. The many victims…
