James Gallagher,Health and science correspondentand
Catherine Snowdon,Health reporter
GettySome men are having vast numbers of children through sperm donation. This week the BBC reported on a man whose sperm contained a genetic mutation that…

James Gallagher,Health and science correspondentand
Catherine Snowdon,Health reporter
GettySome men are having vast numbers of children through sperm donation. This week the BBC reported on a man whose sperm contained a genetic mutation that…