Ecologists have demonstrated that the genetic material that species shed into their environments can reveal not only the presence of the species but also a broad range of information about the genetics of whole populations.
from round goby fish and eDNA samples of water the fish inhabited. They found that the two methods provided comparable genetic information.
In the cells of most animals, the nucleus contains two copies of the full genetic code, but each cell contains 100 to 1,000 copies of a smaller, stripped-down version of the genetic code in mitochondria. Most of the research on eDNA to date has focused on mitochondrial DNA, because it's likely much more abundant in environmental samples, Kara Andres said.
In their Great Lakes study, which involved collecting water and tissue samples from round goby fish in 13 locations from Lake Michigan to Oneida Lake, the researchers found that their eDNA sampling methodology can be used to detect nuclear genetic variations, making it possible to analyze genetic diversity and variation within species.
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