I can see where it would be more about the tasks and the timing, than about the gender of the person performing them. There would be the extreme caretaking of infancy - but if mother was lax towards daughter (as in my case, per family stories, etc) then like the experiments of monkeys raised by wire mommas, they don't know how to be mothers themselves - they lack gender identity - really the capability to nurture. Which I think researchers don't WORRY so much about in women - it's a social problem if men aren't MANLY, but nobody cares if some women aren't womanly.