Question

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#3
○ turners syndrome
○ normal
○ downs syndrome
○ klinefelters syndrome
○ cri du chat syndrome

Explanation:

1. First, analyze the karyotype: it has 47 total chromosomes, with 3 copies of chromosome 21 (trisomy 21), plus one X and one Y chromosome.
2. Match to conditions:

• Turner's Syndrome: 45, X (missing an X) → does not match.
• Normal: 46 chromosomes, 2 of each autosome, XY/XX → does not match.
• Down's Syndrome: Trisomy 21 (3 copies of chromosome 21) → matches the karyotype.
• Klinefelter's Syndrome: 47, XXY → does not match.
• Cri du Chat Syndrome: Deletion on chromosome 5 → does not match.

Answer:

Down's Syndrome