Ol argedco luciftias said:
They changed the DNA of these male mosquitos so that they are infertile. The larva that they make is not able to hatch. I heard from some source that they also made these very sexy and attractive so the females will all want to mate with them. But then the eggs never hatch, or the larva die inside of the eggs. Something like that.
It's even niftier than that actually. The male offspring grows into adults that keep the modified gene and can therefore spread it, while the female offspring dies during the larval stage before it can do any harm. This means the defective gene can spread even further and gradually the amount of females (and males capable of having female offspring) will drop so low that this mosquito species may even go extinct.
I hate parasites so much, so seeing such a clever kind of genocide put into practice makes me very happy.