試題詳解

47. Males of the side-blotched lizard of California can have orange, blue, or tallow throats. Each throat color is associated with a different pattern of behavior. Orange-throat males are the most aggressive and defend large territories that contain many females. Blue-throat males are also territorial but defend smaller territories and fewer females. Yellow-throats are non-territorial males that mimic females and use "sneaky" tactics to gain the chance to mate. Within a population, the fraction of males belonging to each genetically determined type varies over time. In one study population, the most frequent throat coloration changed over a period of several years from blue to orange to yellow and back to blue. Which of the following is not related to the above observation?
(A) Sexual selection
(B) Frequency-dependent selection
(C) A chance event
(D) Game theory