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Expensive tests claiming to trace person's ancestry are as dubious as astrology, warn scientists By Fiona Macrae PUBLISHED: 01:50 GMT, 7 March 2013 | UPDATED: 03:04 GMT, 7 March 2013 Rubbished: Tests that claim to trace a person's ancestry from a DNA sample are no more than 'genetic astrology', scientists have said. Comedian Eddie Izzard has made a TV programme about tracing his family back Expensive tests that claim to trace a person’s ancestry from a DNA sample are no more than ‘genetic astrology’, scientists said last night.