What Is the Leading Cause of Down Syndrome

question 9

Multiple Choice

What is the leading cause of Down syndrome?

• A)In men over 25,sperm formation is impaired and produces monosomic children.
• B)Aberrant implantation in the uterus leads to developmental problems in the fetus.
• C)The nondisjunctional event that produces Down syndrome occurs more frequently during oogenesis in women older than age 35.
• D)In older parents,there is egg/sperm incompatibility leading to duplication of chromosome 21.
• E)In older females,chromosome 21 is duplicated leading to abnormal egg formation.

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