Brian Sykes, a professor of human genetics at the University of Oxford in the UK, declared in an interview with the American Broadcasting Corporation that the male-only Y chromosome, because it is unable to repair by itself gene mutation damage, is gradually degenerating as mankind develops. According to the speed of the gradual demise of the Y chromosome, he thinks that men will ultimately be unable to escape extinction. In about 125,000 years, men may well become extinct from the face of the earth and the earth will become a true "land of the daughters".