Write the causeofdownsyndromeinhumans
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Yogita Ingle 6 years, 7 months ago
Down’s syndrome is an aneuploid, trisomic disease caused by the presence of extra chromosome No. 21. The egg has 24 chromosomes instead of 23 and the offspring has 47 chromosomes (45 + XY/45 + XX) instead of 46 chromosomes. The presence of three chromosomes of the same kind is called trisomy.
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