POPULAR MECHANICS - The famous ape-to-man illustration, known as The March of Progress, depicts evolution as a one-way street toward evolutionary perfection—but nature isn’t always so simple.
Many organisms have displayed what appears to be “reverse evolution,” or regression, where ancient attributes of past ancestors seem to reappear down the evolutionary line. Cave fish, for example, will lose eyesight and return to a state similar to a previous ancestor that lacked this visual organ, but the argument remains whether this is reverse evolution or simply the ending of an evolutionary pathway that creates a vestigial organ.
Of course, complex animals are not the only ones that appear to rewind the evolutionary clock. A new study in Nature Communications, led by scientists at University of California (UC) Riverside, analyzed species of tomato in the Solanaceae family, comparing populations from both eastern and western islands of the Galápagos—that famous Pacific island chain that inspired Charles Darwin’s evolutionary theory nearly 200 years ago.