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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.
This is genome size, the smallest eukaryotic genomes being less than 10 Mb in length, and the largest over 100,000 Mb as seen in following table. Here genome size is Total amount of DNA contained within one copy of a genome. Genome size can be compared to molecular mass using formula 1 pg = 978 Mb = 978000000 bp.