A Couple Has a Child with Down Syndrome

Multiple Choice

A couple has a child with Down syndrome.The mother is 39 years old at the time of delivery.Which of the following is the most probable cause of the child's condition?

A) The woman inherited this tendency from her parents.
B) One member of the couple carried a translocation.
C) Nondisjunction occurred in one member of the couple during somatic cell production.
D) Nondisjunction occurred in one member of the couple during gamete production.