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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.
Moreover, genome size can vary tremendously across even relatively closely related organisms; and this genome size variation does not appear to be tightly coupled to the complexity of the organism. For instance, the genomes of some salamanders are 30 times larger than the human genome.oreover, genome size can vary tremendously across even relatively closely related organisms; and this genome size variation does not appear to be tightly coupled to the complexity of the organism. For instance, the genomes of some salamanders are 30 times larger than the human genome.