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Beyond these basic, universal features, eukaryotic genomes vary dramatically in terms of size and gene counts. Even so, genome size and the number of genes present in an organism reveal little about that organism's complexity (Figure 1).ne pg is equivalent to approximately 1 billion base pairs.) Therefore, genome size is clearly not an indicator of the genomic or biological complexity of an organism. Otherwise, humans would have at least as much DNA as the marbled lungfish, although probably much more.
Thus, bacterial genomes are only about 0.1% as big as the human genome, and have about 10% as many genes as we do. A comparison of those two percentages shows immediately that in bacteria the gene density (how many genes there are per unit length along the genome) is much higher than in humans.