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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.
The sequences of the genomes of bacteria and archaea show that virtually all of the DNA (typically 85-90%) codes for RNA or protein. Figure 3.11 shows that the range of genome sizes is about an order of magnitude, and that the genome size is proportional to the number of genes.igure 3.10 summarizes the minimum number of genes found in each class of organism; of course, many species may have more than the minimum number required for their type. Figure 3.11. The number of genes in bacterial and archaeal genomes is proportional to genome size.