In Down syndrome
A)as the age of the mother increases, the chance of the defect occurring in the unborn children increases.
B)the influence of the father on the defect is equal to that of the mother.
C)most embryos abort before complete term.
D)a person with the defect cannot have a normal child.
E)none of these are true.

Question

Quizplus · Accepted Answer

As the age of the mother increases, the chance of Down syndrome occurring in the unborn children increases. This is because as a woman ages, there is a greater chance of errors occurring in the genetic material that is passed on to the child, which can lead to the extra copy of chromosome 21 that causes Down syndrome.

In Down Syndrome