Similar to a segregation-distorter. This occurs in some mice. The gene causes copies of itself to be present in all it's children by making them all one sex (male). The gene is highly selected for because it makes twice as many copies every generation than the alternative gene. And there is otherwise no difference between a male carrying the gene and one not carrying it.

If you released a gene like that on a species, soon there would be no females left and they would all die out.