09 Jun strayer sci115 week 7 discussions
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week 7
“Effective Evolution and Processes Affecting Evolution” Please respond to the following:
Note: Online students, please respond to one (1) of the following four (4) bulleted items.
The human appendix, a vestigal extension off the large intestine, is homologous to a structure called a caecum, generally larger than our appendix, and houses bacteria that aid in digesting cellulose, the main component of plants. Explain how the presence of the appendix might be used to show our common ancestry with other mammals, and determine what it might tell us about the dietary history of humans. Provide an example with your response.
Geneticists compare DNA base sequences among organisms and from this data determine a gene’s rate of evolution. Different genes have been found to evolve at different rates. Explain why some genes might have faster rates of evolution than other genes as populations adapt to their environments, and give an example with your explanation.
Go to The Economist Website to read the article titled “Subtle poison”, dated March 31, 2012. Explain the main point of the article and how it relates to this week’s lessons. Discuss the effect pesticides and other man-made chemicals could potentially have on the process of evolution, and give examples with your response.
Species have been traditionally characterized as “primitive” and “advanced.” For example, mosses were considered to be primitive, and flowering plants advanced; crocodiles were primitive and mammals were advanced. Most biologists of today think it is incorrect to characterize any modern species as primitive. Determine whether or not you believe it is incorrect to refer to any modern species as primitive, and explain why.
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