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Question: Do chromosomes replace themselves?

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Dear all,

I have been hearing abut how the body (gradually) replaces dead tissue, and replaces it with new tissue. Apparently, the whole body finishes replacing itself every 7 years! So this is my question. Do chromosomes replace themselves like the body cells do? (I think I already know the answer, but I want an in-depth explanation please:).

Please get back to me on this.

Yours sincerely,

Salik Imran, 13.

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