How does chromosomal disorder occur? Write with an example.
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Chromosomal disorder usually occur due to abnormality during replication .
Explanation:
e.g Down syndrome .
In this disorder , during replication of chromosomes 21 .
on division of cells one cell get three chromosomes which is called trisomy and other cell get only 1 chromosome.
in this disorder , the person is not able to develop with time and have intellectual delays.
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