Question

How does chromosomal disorder occur? Write with an example.

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Answer 1

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.