Fruit Flies Provide Evolution's Smoking Gun
Male fruit flies display spotted wings during courtship, and female fruit flies find those spots attractive. Scientists at the University of Wisconsin at Madison have now transferred the genes that cause these spots to fruit flies that don't have them and watched the changes in subsequent generations. The Wisconsin State Journal reports:
the research proves a couple of long-held theories. Certain characteristics, such as spots on a fly's wing, arise simply out of chance. But if that change proves beneficial - if it, for example, makes it more likely that a fruit fly will get a date - genetic mechanisms are there to take advantage and to drive the machinery of evolution.