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Evolution - Lab Report Example

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It represents a critical analysis of experiments on the effects of certain variables on finches living on these two islands. The central focus of these experiments was to hypothesize that…
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Evolution Lab
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Download file to see previous pages The major tool used in this biological experiment was a specially programmed computer application (automated) that enables adjustment of variables from default figures and when run, accurate results on the changes that has occurred in the biological structures of living organisms were shown. These results are therefore used to justify the hypothesis.
In the first experiment, when the independent variable (precipitation) is adjusted to higher levels, the birds evolve smaller beaks. This is because when precipitation is high then the seeds become softer and the birds slowly adjust to the changes of nature until the fully adapt. On the other hand when precipitation is low, the seeds become harder and the need for additional force to crack the seeds arise and based similar principle; the birds evolve stronger and larger beaks over time (Sober, 2008). This adjustment may not favor some birds as the adaptation and evolution process is gradual and therefore may lead to death of individuals that are unable to adjust effectively to the changes of nature.
Natural selection can influence variation of a trait in a population in three major forms namely; diversifying, directional and stabilizing forms (Sober, 2008). In the second experiment, it is clearly evident that changes in the environmental conditions favors the individuals with specific phenotypes. When important parameters that influence natural selection such as precipitation is manipulated (adjusted to 50cm/year and 0cm/year on Wallace Island and Darwin Island respectively), it is noted with great significance that only a few individuals are able to survive and continue reproducing in an environment with low precipitation. This is because of the variation in biological and environmental factors that are very significant for natural selection. Therefore for a period of 300 years, these changes will influence the evolution of Finch beaks and in turn affect their population. This fact can be justified by the graphs ...Download file to see next pagesRead More
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