(D) The original gene sequence is $abcdefg$. The modified sequence is $abcfedg$. Comparing the two,the segment $def$ has been reversed to $fed$. This

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(D) The original gene sequence is $abcdefg$. The modified sequence is $abcfedg$. Comparing the two,the segment $def$ has been reversed to $fed$. This type of chromosomal aberration,where a segment of a chromosome breaks off and reattaches in the reverse orientation,is known as inversion.