What Is the Source of the Extra Chromosome 21 in an Individual

question 12

Multiple Choice

What is the source of the extra chromosome 21 in an individual with Down syndrome?

• A)nondisjunction in the mother only
• B)nondisjunction in the father only
• C)duplication of the chromosome
• D)nondisjunction in either parent
• E)It is impossible to detect with current technology.

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