Types of Down syndrome

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Most common type of Down syndrome

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[A] Trisomy 21
[B] Mosaic Down syndrome
[C] Robertsonian deletion
[D] Translocation Down syndrome

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Least common form of Down syndrome

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[A] Trisomy 21
[B] Mosaic Down syndrome
[C] Robertsonian deletion
[D] Translocation Down syndrome

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In case of Robertsonian translocation Down syndrome the long arm of chromosome 21 is attached to another chromosome, most commonly –

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[A] Chromosome 7
[B] Chromosome 14
[C] Chromosome 21
[D] Chromosome 19

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Types of Down Syndrome

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• Trisomy 21 -Most Common
• Mosaic Down syndrome accounts for – two per cent of Down syndrome cases
• Translocation Down syndrome – accounts for three per cent of cases

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