Mr. and Mrs. Black had a baby last night in the local hospital. At around the same time, Mr. and Mrs. White also had a baby in the same hospital in the room adjacent to the Blacks. Both babies were girls, both weighed about the same, and looked very similar. The following day, a nurse brought the babies from the nursery to the new parents, but Mr. and Mrs. Black insist that they got the wrong baby! To test that, everybody's blood was drawn to establish the blood types. Here are the results:
Mr. Black has blood type O Mrs. Black has blood type AB The baby in Black's room has blood type O
Mr. White has blood type A Mrs. White has blood type B The baby in White's room has blood type A
Try to solve this situation using what you have learned about the alleles and genotypes coding for these blood types to establish if the Blacks' and Whites' babies were switched. Use the Punnett squares to prove your point.

cant u use a 2x2 chart thing to line them up and see the possible outcome?

it’s lava came from an explosive eruption

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."