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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 genome is an organismâs complete set. of DNA. Genomes vary widely in size: The smallest. known genome for a free-living organism (a bac-. terium) contains about 600,000 DNA base pairs, while human and mouse genomes have some. 3 billion (see p. 3). Except for mature red blood. cells, all human cells contain a complete genome.