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In the biological world, references to “dark” substances can also be found. Microbial dark matter is a term sometimes given to microbes that are apparently in several different environments, but they have not yet been specifically cultured in a laboratory setting. Instead, their presence is indicated by detection of their DNA or RNA in various samplings.To read the rest, click on "Is Dark DNA Evolution’s Secret Weapon?"
In the same manner, chromosomal DNA with no known function (aka, junk DNA) has occasionally been referred to as biological dark matter. It is not that this DNA is undetected, but simply its function remains undetermined. Thus, the only thing “dark” about biological dark matter is human understanding.
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