Nature Hates Brand New: Nature Is Very Lazy and Keeps Old Evolutionary Adaptations Around a Long (Long) Time –

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Many previous studies have shown that important evolutionary changes in animals have resulted from the gain, loss, or modification of gene regulatory elements, rather than from the evolution of new protein-coding genes. “Most of the changes that have happened during vertebrate evolution, as animals acquired new body plans and features like feathers and hair, were not the result of new genes but of new regulatory elements that turn genes on and off in different patterns,”

 

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