As people age, their reproductive cells are more prone to errors during cell division. This raises the odds that an extra chromosome will be present and result in the most common form of genetic intellectual disability known as
A)Down syndrome.
B)fragile X syndrome.
C)phenylketonuria (PKU).
D)cretinism.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21 (trisomy 21), which can occur more frequently in the offspring of older parents due to errors in cell division leading to nondisjunction.

As People Age, Their Reproductive Cells Are More Prone to Errors