Use the Following Information for This Question

question 108

Multiple Choice

Use the following information for this question:
Phenylketonuria is considered to be an inborn error of metabolism.It is a recessive genetic condition in which the enzyme that breaks down the amino acid phenylalanine is defective or missing.Testing of all newborns allows this condition to be detected at birth.A special diet that severely minimizes phenylalanine (e.g. ,by avoiding diet sodas and most usual sources of protein) can treat the condition.
In this scenario,two carriers of both cystic fibrosis and phenylketonuria have a child.
What is the probability that the child will have cystic fibrosis and be a carrier for phenylketonuria?

• A) 6.25%
• B) 12.5%
• C) 18.75%
• D) 56.25%
• E) 0%

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Definitions:

Placenta

An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to and removing waste from the fetus through the umbilical cord.

Blood

A vital fluid in humans and animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away.

Placenta

An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to growing babies while removing waste products from the baby’s blood.

Chorion

A membrane that surrounds the amnion and becomes the fetal component of the placenta.