The genes on chromosome were represented as abcdefgh. after chromosomal breakage the order was found to be abcefgh. which type of change has occurred in chromosomal structure

Deletion.

Explanation:

We know that there are three major single-chromosome mutations:

Given: The genes on chromosome were represented as ABCDEFGH. After chromosomal breakage the order was found to be ABCEFGH.

We can see that after breakage gene D has been removed , therefore the change has occurred in chromosomal structure is a type of Deletion.

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