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UK scientists have been given the go-ahead by the fertility regulator to genetically modify human embryos.It is the first time a country has considered the DNA-altering technique in embryos and approved it.The research will take place at the Francis Crick Institute in London and aims to provide a deeper understanding of the earliest moments of human life.It will be illegal for the scientists to implant the modified embryos into a woman.But the field is attracting controversy over concerns it is opening the door to designer - or GM - babies.DNA is the blueprint of life - the instructions for building the human body. Gene editing allows the precise manipulation of DNA.