How do you explain a "brooder" sex evolutionarily?

I've seen several people independently come up with the idea of three or more sexes where one sex is responsible for brooding the young (pregnancy, pouch, feeding, something along those lines) but doesn't actually contribute any DNA. Can you suggest some an evolutionary mechanisms that would support the development of a "brooder" sex that provides caregiving to young without passing on their genes?

is a duplicate

This question has been asked before and has already been answered. It should be marked as a duplicate.

Please enter the URL of the proposed duplicate in the details field below.

not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

Communities

How do you explain a "brooder" sex evolutionarily?

0 comment threads

0 answers