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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.
. Different genes control the development of different characteristics of an organism. Many genes are needed to carry all the genetic information for a whole organism. Nucleus, chromosome and gene. The number of genes and chromosomes varies from species to species.hromosomes and genes. Chromosomes, found in the cell nucleus [nucleus: Controls what happens inside the cell. Chromosomes are structures found in the nucleus of most cells. ] , contain many genes.