Some physical disabilities are the result of genetic abnormalities. An example is Down syndrome, in which:
A) Children have a defective dominant gene
B) Children have a defective recessive gene
C) Children have an extra chromosome
D) Children are missing a chromosome

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21, leading to a total of three copies instead of the usual two. This condition is also known as trisomy 21.

Some Physical Disabilities Are the Result of Genetic Abnormalities