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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 organism to be larger; Cell differentiation (having different types of cells with different functions) The organisms to be more complex; Complexity - Higher tier. Multicellular organisms need specialised organ systems, whereas all the life processes in a unicellular organism take place in that one cell. 1  Multicellular organisms need organ systems to carry out functions such as: 2  Communication between cells, eg the nervous system and circulatory system.