Do the eggs for larger litters come from the same meiosis events, or different ones?
I'm not sure about the ubiquity of this but, in many animals, each primary oocyte that undergoes oogenesis only produces one mature egg. The other products of meiosis are polar bodies, which are not fertilised. These cells often degenerate but can sometimes play supportive roles in embryogenesis.



To answer your question, each mature egg is necessarily from a different meiosis event and so it is not guaranteed that all of the mother's chromosomes are represented in her offspring.