Down syndrome is caused by all except___________?
Correct answer: B. Deletion of 21
- A. Trisomy of 21 chromosome
- B. Deletion of 21
- C. Robersonian translocation of 21.21, 21.18
- D. Mosaicism of 21 chromosome
Explanation
Down syndrome results from full trisomy 21, mosaicism, or an extra chromosome 21 attached by Robertsonian translocation. Deletion of chromosome 21 does not produce the Down syndrome phenotype.
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