What are the possible genotypes and explain if the were switched at birth? The situation pertains to switching of babies and how to determine if there was a switch using ABO blood typing procedures. In order to determine the possible blood types of the offsprings, the blood type of the mother and father must be tested. Please see example below: You have to test the blood type of all concern persons in order to determine if there was a switch of babies. By following the example above you can determine the answer to the situation.
Mary B Anti-A-no agglutination; Anti B-with agglutination

Michael AB Anti-A-with agglutination; Anti-B-with agglutination

Emily B Anti-A-no agglutination; Anti-B-with agglutination

Ernest A Anti-A-with agglutination; Anti-B-no agglutination

Emma O Anti-A-no agglutination; Anti-B-no aggllutination

Michael Jr. B Anti-A-no agglutination; Anti-B-with agglutination

Michelle A Anti-A-with agglutination; Anti B-no agglutination

Mary and Michael possible offsprings: AB, AO, BB

Emily and Ernest possible offsprings: AO, BO, OO

Conclusion: No switch of babies