Only two Y chromosome genes needed for viable mouse sperm
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/11/yamauchi1HR_free.jpg?fit=860%2C460&ssl=1)
Though this mother mouse is the daughter of a male that had only two Y chromosome genes, she gave birth to a litter of healthy pups.
Monika Ward
Though this mother mouse is the daughter of a male that had only two Y chromosome genes, she gave birth to a litter of healthy pups.
Monika Ward