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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.
Number of genes depends on the DNA number in a particular cell and the numbers vary widely among organisms. Therefore, a gene or set of genes determines the differences between individuals within a species as well as differences between species.Human genome consists of over 20,000 genes, and certain genes of humans are also found in other animals and even in certain plants.umber of genes depends on the DNA number in a particular cell and the numbers vary widely among organisms. Therefore, a gene or set of genes determines the differences between individuals within a species as well as differences between species.