What role does variation among individuals play in natural selection?

What role does variation among individuals play in natural selection?

• A. It provides the material on which selection can act
• B. It prevents adaptation
• C. It has no influence on survival
• D. It is always decreasing over generations

Answer: (A)

Variation among individuals provides the material on which natural selection acts. When a population has different heritable traits, the environment creates pressures that favor some versions over others. Those individuals with advantageous traits tend to survive longer and leave more offspring, so the favorable traits become more common over generations. This is how populations become better adapted to their environment. Variation does not hinder adaptation; without it there would be nothing for selection to act upon. It does influence survival because different traits lead to different chances of living and reproducing. And the idea that variation is always decreasing isn’t accurate—selection can reduce variation by favoring a narrow set of traits, but variation can persist or be replenished by new mutations and changing environments.

Variation among individuals provides the material on which natural selection acts. When a population has different heritable traits, the environment creates pressures that favor some versions over others. Those individuals with advantageous traits tend to survive longer and leave more offspring, so the favorable traits become more common over generations. This is how populations become better adapted to their environment.

Variation does not hinder adaptation; without it there would be nothing for selection to act upon. It does influence survival because different traits lead to different chances of living and reproducing. And the idea that variation is always decreasing isn’t accurate—selection can reduce variation by favoring a narrow set of traits, but variation can persist or be replenished by new mutations and changing environments.