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What is Down's syndrome? Give its symoto...

What is Down's syndrome? Give its symotoms and cause. Why is it that the chances of having a child with Down's syndrome incrreases if the age of the mother exceeds forth years ?

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For down.s Syndrome refer chapter 5.
The chances of bearing child with Down.s Syndrome are more with increase in age of mother (+40).Older cells in mother (+40) are more for chromosomal non-disjunction are more in mother due to many physico-chemical during her life time.
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