<p>There are good, logical reasons for not taking your own undergrads in to your grad school, no matter how brilliant and well-educated they are: they boil down to concern for your best undergrads–you want them to get a broader education. This view still holds sway, though it has been trumped by desire to get the best students, period. MIT Bio was a holdout, but I gather they have been doing so, for a couple, three years; Stanford bio still (I think) doesn’t.</p>