[Campbell Biology P.564] Based on the results of the cichlid experiment described in Figure ... | Practice Question

Based on the results of the cichlid experiment described in Figure 24.12, what is the primary conclusion regarding reproductive isolation in Pundamilia species under different light conditions?

  • A: Under normal light, sexual selection promotes interbreeding, while under orange light, it prevents it.
  • B: Reproductive isolation is maintained under both light conditions due to genetic divergence.
  • C: Male breeding coloration acts as a reproductive barrier under normal light, but this barrier is breached under monochromatic orange light.
  • D: Female mate choice is solely determined by species recognition, regardless of light conditions.

Explanation

The experiment's results state that under normal light, females strongly preferred males of their own species indicating sexual selection as a barrier , but under orange light where color distinction was lost , females responded indiscriminately and viable, fertile hybrids were produced. This shows the barrier was breached.