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Essays On Darwins Theory Of Natural Selection

Essay on Charles Darwin's Theory of Evolution by Natural Selection

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Evolution. Is it a fact or fiction? Darwin’s theory has had a great impact on the world today. It has caused many debates between religious authorities and those from the scientific community. This theory prompted individuals to think about the origin of life in the universe.

What distinguishes Charles Darwin from the others is the fact that he collected and provided substantial evidences and he related various branches of science such as geology, botany and biology, which helped, validate his theories. His theory of natural selection as stated by Nelson and Jurmain (1991, p.606) in the modern form is that "the evolutionary factor causes changes in allele frequencies in populations due to differential net reproductive success of…show more content…

It was not until the publication of Charles Darwin's The Origin of Species that the discussion of evolution was revived.
When non-biologists talk about biological evolution they often confuse two different aspects of the definition. On the one hand there is the question of whether or not modern organisms have evolved from older ancestral organisms or whether modern species are continuing to change over time. On the other hand there are questions about the mechanism of the observed changes... how did evolution occur? Biologists consider the existence of biological evolution to be a fact. It can be demonstrated today and the historical evidence for its occurrence in the past is overwhelming. However, biologists readily admit that they are less certain of the exact mechanism of evolution; there are several theories of the mechanism of evolution.


In the study of human evolution, two main methods of dating are used:
· Carbon-14 and potassium-argon dating. Carbon-14 dating involves the decay of radioactive C-14, which has a half-life of 5770 years. This makes this method useful for dating of recent fossils, with good accuracy, up to 50,000 years back. After 5770 years, half of the carbon-14 in a fossil decays to nitrogen-14. Since the ratio of carbon-12 to carbon-14 in a living organism remains the same as in the environment around them because the organism constantly eats and replenishes it, if it were to die, the

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Darwin's Theory of Natural Selection

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If you look at the people around you, are they all the same? What would happen if we lived in a world where all the food was kept 8 feet off the ground and there was absolutely no way you could get it if you weren’t tall enough? Most likely, the short people would die off. The taller ones would multiply, and before long, instead of a population of people of all sizes, you would have a population of only tall people. Living things that are best-suited, or adapted, to their environment survive and multiply. Those that are not, are unable to survive. This process is known as natural selection. This process explains how Charles Darwin’s theory of evolution can occur. The purpose of completing this lab was to demonstrate that natural selection results in populations different than the original because of the adaptations that occur as a result of the population’s environment.
During the lab, we pretended that we were “birds” that eat “beetles”. In the lab, the beetles were represented by the different colored dots. The colors that we used were blue, red, and clear. We started out with 100 dots of each color. We were instructed to gather around the room in a circle, with the dots scattered around in the center on the floor. When the lights were off, we were supposed to wait because it was “night” and we didn’t hunt at “night”. When the lights turned on, it was “morning”, and as the saying goes, “the early bird gets the worm”, or in this case the beetle. :] Everyone in the class tried to get as many beetles as possible in the time limit that was allowed. In the end, 82/100 blue beetles, 84/100 red beetles, and 14/100 clear beetles were captured.
There were different techniques/traits that were used by different people. Some people were really quick and got many beetles, and others were really slow and got very few or none at all. People also used less honorable techniques and stole from other people or they tried to get beetles at night. They figured out which techniques worked well, and which ones did not. The ones that were successful and resulted in a large amount of beetles were used multiple times, and the techniques/traits that proved less successful died out. As a result, the dominant people will reproduce and pass on their successful traits, while the less dominant will be unable to reproduce and their traits will be unable to be handed down to the next generation of offspring.

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Consequently, the population will be filled with more dominance, than weakness.
The variation in beetles also played a role in which ones were captured, and which were not. The beetles that looked most like their environment were least likely to be captured. The clear beetles were the least captured, because they were well adapted to their environment. On the other hand, the blue and red beetles stuck out like sore thumbs and were captured quickly and in large numbers. So, the colored beetles that are able to reproduce will either adapt to their environment, or die out.
In conclusion, this lab was very effective in showing how natural selection works. It also helped to explain how natural selection affects Darwin’s theory of evolution. This lab was also effective in that it demonstrated that natural selection results in populations different than the original because of the adaptations that occur as a result of the population’s environment. The observations made throughout this lab have furthered my knowledge on the subject of natural selection and evolution.

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