Platys and swordtails are related tropical freshwater fish. In studies, researchers have shown that female platys prefer males with swordtails, even though males of their own species do not have them. This was discovered by attaching artificial swordtails to platys males.What does this suggest about the origin of the swordtail feature?
A. The same gene that causes sword development also causes development of neural circuits for female preference.
B. Female preference for swords may have predated the origin of the feature itself.
C. Evolution of swords later led to evolution of female preference for swords.
D. Adjacent genes on the same chromosome cause sword development and development of neural circuits for female preference.
Answer: B
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