Carlos and Maria were ecstatic to have two healthy babies. Within the first hour
ID: 100619 • Letter: C
Question
Carlos and Maria were ecstatic to have two healthy babies. Within the first hour, the babies had been cleaned, measured, and their heels pricked for blood samples. These initial blood tests were to assess for PKU (phenylketonuria), thyroid hormone levels, cystic fibrosis, and several other metabolic disorders. To their surprise, their new daughter tested positive for PKU. Neither Carlos nor Marla had PKU. 1. What are the chances that their son will have PKU as well? a. 25% b. 50% c. 75% d. 0% Thankfully. their son tested negative for PKU. But, as they wore discussing genetic testing, Maria remembered that her father had been color blind. She wondered whether that meant her son would also be color blind. 2. They couldn't tell yet, but what were the chances that Maria and Carlos son would be color blind? a. 25% b. 50% c. 75% d. 0% Carlos and Maria were so happy with their new twins. They were thinking about trying to have more children... maybe in a few years. 3. Having had one boy and one girl, what are Carlos and Maria's chances of having another boy? a. Depends on the timing of the fertilization b. 25% c. 50% d. 75%Explanation / Answer
1. 0% There are 0% chances that there son will have PKU as well .
2. 50% . chances that maria and carlos's son would be colour blind if his maternal grandfather was colour blind.
3. 50% There are 50% chances that after having one boy and one girl . There third child will be a boy.