Cloning could be used to save species—or make human “organ sacks”

This week I spoke to scientists who have found a way to turn male mouse embryos female.

This week I spoke to scientists who have found a way to turn male mouse embryos female. They’ve developed a CRISPR-based approach to essentially cut out the Y chromosome. It allowed them to create female clones of male mice. That’s right: female animals that are genetically…