One out of 800 babies are born with an extra chromosome at pair 21, which results in the child having a moderate to severe intellectual disability and a shortened life expectancy of around 49 years. This condition is known as
A)cretinism.
B)phenylketonuria (PKU).
C)Down syndrome.
D)fragile-X syndrome.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra chromosome at pair 21, leading to the characteristics described, including intellectual disability and a shortened life expectancy.

One Out of 800 Babies Are Born with an Extra