Which of the following statements regarding Down syndrome is correct?
A)Down syndrome is the result of a chromosomal duplication.
B)The age of the mother has nothing to do with the frequency of births of children with Down syndrome.
C)The frequency decreases with the age of the mother.
D)The frequency increases with the age of the mother.

Question

Quizplus · Accepted Answer

Down syndrome is caused by a chromosomal abnormality, specifically an extra copy of chromosome 21. The frequency of births of children with Down syndrome increases with the age of the mother. This is likely due to errors in meiosis that can occur more frequently in older women.

Which of the Following Statements Regarding Down Syndrome Is Correct