Prokaryotic genetic system has

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In the prokaryotes such as bacteria, the genetic system or the genetic material consists of a single circular chromosome made up of DNA. Due to the absence of a nucleus in prokaryotes, the genetic material is not present inside the nucleus.

Unlike eukaryotic DNA that binds with basic proteins histones (H2A, H2B, H3, H4, and H1) to form a structure known as nucleosome, the prokaryotic DNA lacks histone proteins (except the domain Archaea).

The main function of histone is to package the eukaryotic DNA in a smaller space. In the prokaryotes, they package their DNA in a small space by supercoiling.