Which of the Following Could Explain How Some (Although Not

question 11

Multiple Choice

Which of the following could explain how some (although not many) people can have Down syndrome and have a normal chromosome number?

• A)One of the cells during development had trisomy 21 but then died.
• B)An unbalanced translocation carrying most of chromosome number 21 occurred.
• C)A large enough fragment of one copy of chromosome number 21 underwent a deletion.
• D)Some of the genes in one copy of chromosome number 21 were mutated.
• E)None of the answer options is correct.

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