Japanese researchers have made a breakthrough in reproductive science after creating mice with 2 biological fathers. A team led by renowned fertility pioneer Professor Katsuhiko Hayashi could generate eggs from male mice’s skin cells by turning male XY sex chromosomes into female XX ones. After the eggs were fertilised, they were implanted into surrogate female mice, who then birthed healthy mouse pups. The team is now attempting to replicate the development with human cells – something that could take many years as scientists are yet to create viable lab-grown human eggs from female cells. If successful, same-sex couples could one day have their own biological children and help infertile women who cannot produce their own eggs. Given that’s some time off, those with ethical concerns about the hyper-modern approach to reproduction will have plenty of time to get organised…