What do we call structures that are inherited from ancestors but have lost much or all of their original function due to different selection pressures acting on the descendant? These structures are still there because they are in the DNA, but they are not really needed anymore: ex: hind limbs and pelvic bone of a whale
Ex: appendix in humans
.

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Aperson is outside exercising. body temperature begins to rise, and the person starts to sweat. their body temperature then returns to normal, and the body stops sweating. a positive b negative c allosteric d homeopathic

What is the key to the recognition of codominance?