Individuals with traits better suited to their environment are more likely to survive and reproduce, passing on those advantageous traits to their offspring.
Here's a breakdown of the key components:
* Variation: Individuals within a population have slight differences in their traits, like size, color, or behavior. These variations arise from mutations, which are changes in DNA.
* Competition: Organisms compete for resources like food, water, shelter, and mates.
* Survival and Reproduction: Individuals with traits that help them survive and reproduce in their environment are more likely to pass their genes onto the next generation.
* Inheritance: The traits that increase survival and reproduction are inherited by offspring.
Over time, this process leads to a gradual change in the population's genetic makeup, favoring traits that are advantageous in a particular environment.
Examples of Natural Selection:
* Peppered Moths: During the Industrial Revolution, dark-colored moths became more common in polluted areas because their coloration provided camouflage against the soot-covered trees.
* Antibiotic Resistance: When bacteria are exposed to antibiotics, those with mutations that allow them to survive the antibiotic will reproduce and pass on their resistance.
Key Points to Remember:
* Natural selection does not create new traits; it merely acts on existing variations.
* Natural selection is not a random process. It's driven by the environment and the traits that provide a survival advantage.
* The process of natural selection is constantly occurring in all populations, leading to the evolution of species over time.
