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People with Down syndrome, also called mongoloidism have 47 chromosomes. Having 65 chromosomes would be lethal, as normally having 47 chromosomes is lethal. Down syndrome is also known as trisomy 21, because instead of two copies of chromosome 21, a person with Down syndrome has three copies, which accounts for the 47th chromosome.

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Q: Why is it that a mongoloid person have 65 chromosomes?
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I think you are referring to Down's syndrome. It is due to abnormal number of chromosomes in the cells There is no cure.


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