What is coevolution?

What is coevolution?

• A. Reciprocal genetic changes in interacting species.
• B. A change in a single species' gene pool without effects on others.
• C. Random fluctuations in allele frequencies over time.
• D. Mutations that occur only in response to environmental stress.

Answer: (A)

Co-evolution is when two or more species influence each other’s evolution through their interactions, leading to reciprocal genetic changes over generations. For example, in a predator–prey relationship, prey species evolve better defenses like faster escape, warning signals, or toxins, and predators respond by becoming faster, stealthier, or developing sharper hunting skills. This back-and-forth pressure can drive an ongoing “arms race,” with traits in both sides becoming more specialized over time. Mutualistic pairs, such as flowering plants and their pollinators, show the same pattern: plants evolve traits that attract specific pollinators, while those pollinators evolve behaviors or physiologies that make them efficient at obtaining nectar. Importantly, coevolution requires interactions between species; it isn’t just a change in one species’ genes alone, it isn’t random genetic drift over time, and it isn’t simply mutations that occur due to environmental stress in isolation.

Co-evolution is when two or more species influence each other’s evolution through their interactions, leading to reciprocal genetic changes over generations. For example, in a predator–prey relationship, prey species evolve better defenses like faster escape, warning signals, or toxins, and predators respond by becoming faster, stealthier, or developing sharper hunting skills. This back-and-forth pressure can drive an ongoing “arms race,” with traits in both sides becoming more specialized over time. Mutualistic pairs, such as flowering plants and their pollinators, show the same pattern: plants evolve traits that attract specific pollinators, while those pollinators evolve behaviors or physiologies that make them efficient at obtaining nectar. Importantly, coevolution requires interactions between species; it isn’t just a change in one species’ genes alone, it isn’t random genetic drift over time, and it isn’t simply mutations that occur due to environmental stress in isolation.