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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 team wrote that evolution can only produce a genome devoid of 'junk' if and only if the effective population size is huge and the deleterious effects of increasing genome size are considerable.. The problem for evolution in their words is that In humans [the] effective population size is pitiful..