Why would this make them more different? Do you think one twin wins a resource competition and the other loses? Why do you think that?
I don’t understand your questions. Why would it not make them more different? The competition introduces another source of variability: what fraction of the resources a particular fetus gets. A singleton has no such randomness, since it just gets 100%, there’s no competition.
I don’t understand your questions. Why would it not make them more different? The competition introduces another source of variability: what fraction of the resources a particular fetus gets. A singleton has no such randomness, since it just gets 100%, there’s no competition.