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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.
By contrast, a multicellular organism is made up of many cells that are dependent on each other to perform these essential functions as a group. The cells have divided up the labor and each cell has become specialized to perform a specific task.This specialization is a key characteristic of multicellular organisms.y contrast, a multicellular organism is made up of many cells that are dependent on each other to perform these essential functions as a group. The cells have divided up the labor and each cell has become specialized to perform a specific task.