In both parents are carriers of PKU

A one child out of four will develop the disorder
B none of the children will develop the disorder
C their daughters are more likely to develop the disorder than their sons are.
D all of their children will develop the disorder

I believe A is the correct answer

AFP can be used to
A assess sex chromosome abnormalities
B detect neural tube defects
C assess some degree of mental retardation
D measure anzyme levels in the fetus

I belive the correct answer is B

I think both of your answers are right.

To determine which answer is correct for the first question, we need to understand PKU (Phenylketonuria). PKU is an inherited disorder caused by a gene mutation. Both parents must be carriers of the PKU gene mutation to have a chance of passing it on to their children. If both parents are carriers, there is a 25% chance (or one child out of four) that their child will develop PKU. Therefore, the correct answer is A - one child out of four will develop the disorder.

For the second question, we need to know what AFP (Alpha-fetoprotein) is used for. AFP is a protein produced by the developing baby (fetus) during pregnancy. It is measured in maternal blood or amniotic fluid tests to assess certain conditions in the baby. One of the main uses of AFP testing is to detect neural tube defects, such as spina bifida, in the developing baby. Therefore, the correct answer is B - AFP can be used to detect neural tube defects.