Which concept explains the persistence of a costly trait like a peacock's tail because it signals quality to mates?

Which concept explains the persistence of a costly trait like a peacock's tail because it signals quality to mates?

• A. Sexual selection
• B. Kin selection
• C. Social learning
• D. Classical conditioning

Answer: (A)

Sexual selection explains this. The peacock’s tail is a costly trait that evolves because it helps males attract mates. Females prefer mates with impressive tails, so those traits are passed on even though they hinder survival. The idea here is that the tail acts as an honest signal of genetic quality: only males in good condition can afford the cost of producing and carrying such a display, so the preference for it conveys reliable information to potential mates. This is why the trait persists across generations through mate choice. The other concepts don’t fit this situation: kin selection involves helping relatives, not signaling to attract mates; social learning and classical conditioning are about learning processes, not evolutionary signals of mate quality.

Sexual selection explains this. The peacock’s tail is a costly trait that evolves because it helps males attract mates. Females prefer mates with impressive tails, so those traits are passed on even though they hinder survival. The idea here is that the tail acts as an honest signal of genetic quality: only males in good condition can afford the cost of producing and carrying such a display, so the preference for it conveys reliable information to potential mates. This is why the trait persists across generations through mate choice. The other concepts don’t fit this situation: kin selection involves helping relatives, not signaling to attract mates; social learning and classical conditioning are about learning processes, not evolutionary signals of mate quality.