Mice can be male without Y chromosome
Genetic manipulations enable female embryo to develop as opposite sex, study shows
![mice](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/01/012816_ti_y-chromosome_free.jpg?fit=860%2C460&ssl=1)
MADE MALE This male mouse (white) has no Y chromosome, but was able to father pups (brown) when scientists injected his immature sperm into eggs. Researchers made the mouse male by manipulating genes on other chromosomes.
Yasuhiro Yamauchi