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Mutations is considered by scientists to be primarily responsible for evolution. Mutations are essential to evolution. Every genetic feature in every organism was, initially, the result of a mutation. The new genetic variant (allele) spreads via reproduction, and differential reproduction is a defining aspect of evolution.
The processes that can alter the genetic makeup of a population are: genetic drift, mutation, gene flow, and natural selection. Of these, natural selection is considered by scientists to be primarily responsible for evolution.
Step 1: Natural selection is the process by which certain traits become more common or less common in a population over time. This happens when individuals with certain traits are more likely to survive and reproduce than others. For example, if there is a change in the environment, some individuals may have traits that make them more likely to survive and reproduce in that environment, while others may not.
Step 2: As individuals with certain traits reproduce, their offspring will also have those traits. Over time, these traits become more common in the population. This means that the traits that are beneficial for survival and reproduction will become more common, and those that are not beneficial will become less common.
Step 3: As the population evolves, the genetic make up of the population changes. This change is due to natural selection, which is the primary cause of evolution. Over time, the population will become better adapted to its environment, as the traits that are beneficial will become more common and the traits that are not beneficial will become less common.
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