An organism's complexity is directly related to the amount of junk DNA.
Most eukaryotic genomes are larger and more complex than those of prokaryotes. However, the genome size of many eukaryotes does not appear to be related to genetic complexity.
For example, the genomes of salamanders and lilies contain more than ten times the amount of DNA that is in the human genome, yet these organisms are clearly not ten times more complex than humans.
Further studies showed that in the human genome only 2.5%of the genes are coding for protein while the rest of the 97.5% of genes are non-coding genes or junk DNA.
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