oh, ok.
i thought that the reason why the alien warriors were born different was because of just different genetic material in the host. like in regular human birth, not everyone is born the same because of genes. so maybe when the embryo is placed in the host, the embryo takes on some of the hosts genetic properties, coming out either warrior, drone, runner, or queen. ....maybe that's why ripley had an alien queen, because ripley was so strong willed and stuff, that the embryo took on those genetic properties of her, causing it to become a queen.
plus that would also explain why the runner came out different. dogs have different genes from hmans (obviously) so it took on the genes from the dogs.
that could also support the theory of warriors coming out of women, and drones coming out of men.
just a thought..........