Question

a fetus has 47 chromosomes. what is the most likely conclusion drawn from this information?
a. the child has down syndrome.
b. the child has phenylketonuria (pku).
c. the child has sickle - cell anemia.
d. this is a normal number of chromosomes.

Explanation:

Normal humans have 46 chromosomes. Down - syndrome is caused by an extra copy of chromosome 21, resulting in 47 chromosomes. PKU is a metabolic disorder not related to chromosome number. Sickle - cell anemia is a genetic disorder due to a single - gene mutation, not a change in chromosome number. 47 chromosomes is not a normal number.

Answer:

A. The child has Down syndrome.