LING123_Essay1.docx - Professor Kataoka LING 123 Essay#1 Relationship Between Natural Selection and Sexual Selection Traits are features or

LING123_Essay1.docx - Professor Kataoka LING 123 Essay#1...

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Professor Kataoka LING 123 March 11, 2019 Essay #1 Relationship Between Natural Selection and Sexual Selection Traits are features or characteristics that species have, which can be seen through their appearances such as sizes and colors. It can also be seen through their behaviors, such as their skills in flying or fighting. The question is how these traits are being inherited and adapted to species over generations? The purpose of any theory of trait evolution is to survive. However, there are some cases when this theory is not accurate. In this paper, I will be explaining Darwin’s theories of natural selection and sexual selection and discuss how sexual selection is a special case of natural selection in terms of survival traits. English naturalist Charles Darwin proposed a theory that species evolve over time to become adapted to their environments, which is called, natural selection theory. The main idea of natural selection is that species increase their genes of certain characteristics that are advantageous for reproduction in a certain environment to leave more offspring in the next generation. In natural selection process, adaptive traits in terms of survival are typically produced. For example, there are some beetles that are green and brown and green beetles tend to get eaten by bird and survive less often than brown beetles do. In this case, the more advantageous trait, brown coloration would become more common in the population because they reproduced more offspring. However, the problem of this theory is that there are some characteristics that dominates certain species that would not increase survival. According to natural selection theory, conspicuous traits such as a bright color of peacock’s feather is not
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expected to evolve because it does not help in terms of survival but rather make this animal more visible to predators. Darwin later explained that these traits do not increase survival, but instead increase reproductive success and this is called, sexual selection.
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