DNA guidelines specify that G all the time pairs with C, and A with T. But, when it is all added up, the quantity of G+C vs A+T content material amongst species will not be a easy mounted proportion or, customary one-to-one ratio. Biologists have now experimentally demonstrated that G+C composition is mostly strongly favored by pure choice, whatever the class of DNA, measurement of a species’ genome, or the place the species is discovered on the evolutionary tree of life.

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