Discussion Topic Mechanisms of Evolutionary Change This unit we are learning tha

Question

Discussion Topic Mechanisms of Evolutionary Change This unit we are learning that there are several mechanisms that lead to evolutionary change within a population or species: mutation, migration, genetic drift, non-random breeding and natural selection. What is meant by "evolutionary change": meaning what is it and how would you know when it has occurred? Select two of the mechanisms listed above and explain how each can lead to evolutionary change as defined in Q#1. Be specific and use an example of each.

Explanation / Answer

1. Evolutionary change is a gradual change in the characteristics of a population of animals or plants over successive generations.Evolution occurs with a population because individuals have different sets of these traits that affect their ability to survive and reproduce. For example, some individuals may be better at finding food, hiding from predators, or attracting mates. Those organisms with traits that help them to survive and reproduce are more likely to pass genes responsible for those traits to the next generation, a process termed natural selection. Over time, the distribution of characteristics in the population change, reflecting a change in the genetic makeup of the population. This process helps to account for the differences we see within species (microevolution) as well as the emergence of new species (macroevolution).

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