28) It asks for the genotypes of the offspring of boxes 1 and 4. You're given the genotypes of both parents (look at the row and column letters) which is BB and bb. If you create a new punnet square with these genotypes, each offspring will have the Bb geneotype. I would go with answer choice F.
29) It doesn't show all of the answer choices but you can see in the illustration that the DNA is separating. That should help you narrow down the answer.