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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 past few years have witnessed the discovery of both very large and small genomes in different groups of organisms. Here are some highlights from this research. The first represents the largest genome so far reported for a crustacean, in the Arctic-dwelling amphipod Ampelisca macrocephala.The genome of this small invertebrate is a whopping 63.2 billion base pairs, or about 20 times larger than the human genome (Rees et al. 2007).he past few years have witnessed the discovery of both very large and small genomes in different groups of organisms. Here are some highlights from this research. The first represents the largest genome so far reported for a crustacean, in the Arctic-dwelling amphipod Ampelisca macrocephala.