Environmental Science – Biodiversity Practice Test Prep

The evolution of a population is driven significantly by the process of natural selection, which acts on advantageous traits. In a given environment, individuals with traits that provide a survival or reproductive advantage are more likely to survive and reproduce, passing those beneficial traits onto the next generation. Over time, this leads to a gradual shift in the population’s characteristics, resulting in evolutionary changes.

For example, consider a population of insects where some individuals can better camouflage themselves from predators due to their color. If these camouflaged individuals survive longer and reproduce more than their less camouflaged counterparts, the population will gradually display more of the advantageous trait—better camouflage. Thus, natural selection is a fundamental process that shapes the genetic makeup of populations, facilitating evolution.

Other processes may affect populations, but they do not directly lead to evolutionary changes through the adaptive mechanism that natural selection provides.