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प्रश्न
How many total chromosomes does a human with Down's Syndrome have?
पर्याय
47
46
48
45
MCQ
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उत्तर
A human with Down's Syndrome has 47 total chromosomes (44 autosomes + 2 sex chromosomes + 1 extra chromosome 21). This is represented by the karyotype 47, +21. The extra chromosome 21 results from nondisjunction errors during meiosis, typically during maternal oogenesis.
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