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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.
Simple organisms may be unicellular, consisting of just one cell, while more complex organisms are multicellular. There are two types of cell division.Mitosis is used for growth and repair and produces diploid cells identical to each other and the parent cell.n ameoba, a simple unicellular organism. Organisms can consist of one cell to many cells: 1  Simple organisms may be unicellular (consist of one cell). 2  Complex organisms are multicellular (consist of many cells).