15. Unlike identical twins, fraternal twins A. are produced from two identical embryos.
B. result from the same fertilized egg.
C. are always the same sex.
D. result from two eggs fertilized by different sperm.
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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

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