Final answer:
The two types of independently replicating genomes in bacterial cells are plasmid DNA and chromosomal DNA, with plasmids being small circular DNA molecules that can transfer between bacteria, and chromosomal DNA being a single circular chromosome located in the cell's nucleoid.
Step-by-step explanation:
The two types of independently replicating genomes in bacterial cells are plasmid DNA and chromosomal DNA. Plasmid DNA consists of small circular, independent double-stranded DNA molecules that can be transmitted from one bacterium to another. On the other hand, chromosomal DNA in prokaryotes usually comprises a single, double-stranded circular chromosome located in a region of the cell called the nucleoid. This main genetic material is essential for the survival and reproduction of the bacteria. Unlike eukaryotes, bacterial cells lack a nucleus, and their DNA replication occurs in the cytoplasm, resulting in binary fission where the DNA is duplicated and partitioned into two daughter cells.