SUPPLEMENTARY MATERIAL Yale University: Science Education Outreach Program

III.D) A Mix-Up at the Hospital

On June 6 at approximately 1:00 pm, Mrs. Smith, Mrs. Stevenson and Mrs. Jones each delivered a healthy baby boy at Metropolitan General Hospital. At 1:20 pm, the hospital's fire alarm sounded. Nurses and orderlies scrambled to evacuate patients and the three new babies were rushed to safety. After the danger had passed, the hospital staff was distressed to find that in the confusion, they had forgotten which baby was which! Since the babies were rescued before receiving their identificatin bracelets, there was no easy way to identify them. Dr. Anne Robinson, head of pediatrics, ordered that DNA typing be performed on the babies and their parents.

The DNA typing laboratory looked at two different highly variable chromosome regions. The DNA profiles from the babies and the parents are shown below. Your job is to decide which baby belongs to which set of parents......