Every dog parent has experienced it: that moment when your dog suddenly decides to go on a sprinting spree. Your mild-mannered pup is replaced by a high-octane speed racer who runs around the home, darting back and forth, and, it seems, having a great time. Most pet parents refer to ...
The way they do this is clever: since female chickens are ZW and males ZZ (in birds ,the heterogametic sex is female), they gene-edited the Z chromosome in a way that if blue light is shown on the embryo, it aborts. You then cross a ZZ male that has no modified Zs with a WZ*...