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How much of our DNA is useless junk?

At least 75 percent of the human genome consists of non-functional, junk DNA. The functional portion of the human genome probably constitutes only about 10 to 15 percent of our overall DNA.

At least 75 percent of the human genome consists of non-functional, junk DNA. The functional portion of the human genome probably constitutes only about 10 to 15 percent of our overall DNA.

Sources

https://www.sciencealert.com/new-evidence-suggests-at-least-75-of-the-human-genome-is-actually-junk-dna