When a part of a chromosome is left out, a deletion occurs

When part of a chromatid breaks off and attaches to its sister chromatid, an insertion occurs. The result is a duplication of genes on the same chromosome.

When part of a chromosome breaks off and reattaches backwards, an inversion occurs.

When part of one chromosome breaks off and is added to a different chromosome, translocation occurs.

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Section 11.3

Chapter 11 test

Question	Answer
Deletion	When a part of a chromosome is left out, a deletion occurs
Insertion	When part of a chromatid breaks off and attaches to its sister chromatid, an insertion occurs. The result is a duplication of genes on the same chromosome.
Inversion	When part of a chromosome breaks off and reattaches backwards, an inversion occurs.
Translocation	When part of one chromosome breaks off and is added to a different chromosome, translocation occurs.