a) Insertion sequence:
- It is a mobile piece of DNA that is capable of inactivating a gene into which it inserts.
- They are believed to be responsible for spontaneous gene mutation in bacteria and bacteriophage.
- When this insertion sequence transposes, this direct repeat remain at the site of insertion in the host chromosome.
- It is a DNA Segment capable of changing its location within or between the chromosome.
- They are usually 2000 bp long and carry one or more genes unrelated to their transposability.
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