For the first time, mice born to two fathers have grown up and produced offspring, scientists in China have revealed. The researchers at Shanghai Jiao Tong University managed to insert two sperm cells - one from each father - into a mouse egg whose nucleus had been removed. A gene editing technique was then used to reprogram parts of the sperm DNA to allow an embryo to develop – a process called androgenesis. The embryo, featuring the genetic material from two fathers, was transferred to a female womb and allowed to grow to term. Finally, the resulting offspring (male) managed...