From ScienceDaily: Mothers Pass On Disease Clues To Offspring
Apparently in many species, when females are pregnant and they might get ill, they produce less aggressive male offspring with a better immune system, and "[t]he results of this new study support the existence of a ‘trade off’ between social dominance and disease resistance."
Ha! So see, my desire for a less aggressive mate makes sense. Better disease resistance to pass down. Fuck social dominance, those assholes.