Regarding Down syndrome, which of the following statements is FALSE?
A)Although Down syndrome is genetic, it is not usually hereditary, that is, it doesn't "run in the family."
B)Down syndrome is caused by an extremely thin area occurring on the X chromosome.
C)The age of the parents is a major factor in Down syndrome.
D)Down syndrome causes moderate to severe intellectual disability and a shortened life expectancy of around 49 years.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21 (trisomy 21), not by abnormalities in the X chromosome. This is a fundamental aspect of its genetic basis, distinguishing it from conditions linked to the sex chromosomes.

Regarding Down Syndrome, Which of the Following Statements Is FALSE