... bacteria,) and in the case of plants and algae, a chloroplast genome (same as mitochondrial.) Bacterial genome consists of one circular (ds) DNA molecule (a chromosome) in the nucleoid as well as circular plasmid DNA that carry genes for cellular replication and other functions Genome size is expressed as the number of base pairs (bp) (or Kb, Mb, and Gb) Genome size ... : Can be triggered by chemicals, radiation Or arise spontaneously Or be inherited Or be introduced by viruses DNA mutations involve three main classes of genes: 1) oncogenes their presence triggers cancer arise by mutatio...

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