Regarding Down syndrome, which of the following statements is FALSE?
A)The older a women is when she becomes pregnant, the greater her risk of giving birth to a child with Down syndrome.
B)In a small percentage of cases, an older father is the source of the extra chromosome.
C)Down syndrome is a hereditary condition, that is, it tends to run in families.
D)Down syndrome children have an extra 21st chromosome with the condition being known as trisomy-21.

Question

Quizplus · Accepted Answer

Down syndrome is not considered a hereditary condition in the traditional sense, as it does not tend to run in families. Most cases are caused by a random error in cell division that results in an extra 21st chromosome (trisomy 21).

Regarding Down Syndrome, Which of the Following Statements Is FALSE