>>11509885Because copies of itself exists in it's brothers and sisters. The gene only activates when it detects the body is a loser, and so;
In a group 3 animals. One in which they all have the gene, and ones that don't.
If one of the animals were weak out of each set of 3, the set that have the suicide gene would leave only two animals left, to share resources between resulting in two healthy individuals and one dead.
The 3 that don't might all end up as 3 sickly animals.
Thus the gene for suicide continues.
