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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.
These different responses largely have to do with differences in genetics. Every person has a genome (all of the DNA in an organism) with 20,000 to 25,000 genes, and each gene contains hundreds to millions of DNA nucleotides.