Which of the following statements regarding Down syndrome is TRUE?
A) It is due to a defect in the sex chromosomes.
B) If one identical twin has the disorder, the other twin will not have the disorder.
C) These individuals have brain shrinkage and are at risk for Alzheimer disease as they age.
D) Individuals with the disorder must be hospitalized throughout much of their lives.

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra copy of chromosome 21. These individuals may experience brain shrinkage and are at higher risk for developing Alzheimer's disease as they age. However, they do not require hospitalization throughout their lives. Option A is incorrect as Down syndrome is not caused by a defect in the sex chromosomes. Option B is incorrect as identical twins share the same genetic material and both may have Down syndrome if one twin has it. Option D is incorrect as individuals with Down syndrome can lead independent lives with appropriate support.

Which of the Following Statements Regarding Down Syndrome Is TRUE