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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.
GENOMES OF BACTERIA. So far in the course, we have been considering the genetics of eukaryotic organisms. Bacteria (prokaryotes) are much smaller in size than eukaryotic cells, and they have much smaller genomes. 1.hat common features are found in bacterial genomes that have been sequenced? The genome of E. coli (sequenced in 1997) is about 4 million base pairs with about 3000 genes. These numbers are quite average for bacteria; i.e., most have a genome size of several million base pairs containing a few thousand genes.