Which of the following disorders results from a mutation that produces an extra chromosome 21?
A) Down syndrome
B) meningitis
C) tardive dyskinesia
D) general paresis
E) multiple sclerosis

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra copy of chromosome 21, resulting in a total of three copies instead of the typical two. Meningitis, tardive dyskinesia, general paresis, and multiple sclerosis are not caused by a mutation that produces an extra chromosome 21.

Which of the Following Disorders Results from a Mutation That