Author Question: Down syndrome is caused by A) improper migration of brain cells during brain development. B) an ... (Read 40 times)

anshika · **on:** Jun 22, 2018

Down syndrome is caused by

A) improper migration of brain cells during brain development.
B) an inherited faulty gene.
C) a genetic error in which a vital enzyme is missing in the brain.
D) the presence of an extra twenty-first chromosome.
E) obstetric difficulties at the time of birth.

Question 2

Treatment for phenylketonuria consists of early diagnosis and

A) a diet low in thyroxine.
B) a complete blood transfusion at birth.
C) a shift to diet low in phenylalanine.
D) lifelong supplemental phenylalanine.
E) daily injections of the precursor of phenylalanine.