Trisomy 8 Usually Leads to Early Miscarriage of a Fetus

question 34

Multiple Choice

Trisomy 8 usually leads to early miscarriage of a fetus. However, adult individuals have been found with cells that have three copies of chromosome 8 in them. How can this be?

• A) The trisomic 8 adults likely have a mosaic region with trisomy 8.
• B) The trisomic cells underwent complete nondisjunction.
• C) The trisomic cells underwent a meiotic nondisjunction.
• D) This individual must be triploid.

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