Continental drift

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    Introduction Fredrick Douglass once said “If there is no struggle, there is no progress.” (Douglas, n.d.). This seems to fit the life of Alfred Wegener and his struggle to prove his theory of Pangaea and continental drift. A brief overview of his life, his research, and difficulties he faced will be presented. In addition, discussing why Mr. Wegener’s theory was so widely criticized, other scientists’ objections, and his use of certain fossil organisms for his theory. Mr. Wegener’s Life Alfred Wegener was born in Germany in 1880 and later went on to study at the University of Berlin where he completed his doctorate in astronomy in 1904 (Hughes, 1994). Instead of pursuing astronomy, Mr. Wegener was intrigued by meteorology and went on to…

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    Continental Drift Gondwana was an ancient supercontinent that existed hundreds of millions of years ago. It was made of many continents that we know today. It broke up a long time ago because of something called Continental Drift. Continental drift is what it is called when the tectonic plates move around and rearrange and reshape the continents. Gondwana was made up of 5 main pieces; Africa, South America, Australia, India, and Antarctica. Gondwana existed roughly 300-180 million…

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    Dear US Geological Survey, I think that you should accept Alfred Wegener’s Theory of Continental Drift. There is a large amount of realistic evidence to prove that this theory did occur. Wegener’s theory is that all seven continents were once joined into a supercontinent called Pangaea. He believes that after continents were in that supercontinent, they gradually moved apart over more than a hundred years ago and will continue to move in the future. This Theory of Continental Drift is supported…

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    Continental drift was an idea raised in early 17th century by Sir Francis Bacon, as he wrote of the apparent shoreline fit of opposite sides of the Atlantic which was much like pieces of a puzzle (Figure 1). The fit was computed by Sir Edward Bullard in 1960s later (Figure 2). Later in 1912, Alfred Wegener, a German geophysicist who was the first to propose the continental drift theory with a mechanism, suggested that all the lands were once joined together as a supercontinent – Pangaea, which…

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    Alfred Wegener was a german scientist who developed the theory of Continental drift. He believed all the continents were one land mass. He called this super continent “Pangea”. Wegener used evidence from three sources to support his theory. First, was fossil evidence from reptiles and plants. “Cynognathus” was a reptile that had fossils found on South Africa, and Africa. This is only possible because of continental drift, the animal couldn't have swam across a whole ocean. The next reptile is…

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    used. A population is in Hardy-Weinberg equilibrium if there is no change in the allele and genotype frequencies from generation to generation. The five conditions that must be met for a population to be in Hardy-Weinberg equilibrium include: no mutations, random mating, no natural selection, extremely large population size, and no gene flow. If one or more of these conditions are not met, then evolutionary change will occur. In nature, the Hardy-Weinberg equilibrium conditions are rarely met.…

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    Sickle Cellular Adaptation

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    of assertive mating in species, he emphasizes that it has “relatively little effect on the features of the distribution of the sickle cell gene in West Africa” (Livingstone, 1958, p. 534). Gene flow was one of the forces that mainly showed the distribution of the sickle cell gene in West Africa. I figured that gene flow might possibly explain the migration of various groups in West Africa. For example, the group that migrated to one geographic region to another might breed with the locals,…

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    RESULTS: An experiment was conducted to document the patterns of evolution in the fictional species, Cannus stannous. Fitness of the C. stannous population is determined solely by its ability to retain heat. Three genes determined heat retention; can size, skin type, and water level. Each gene had three alleles, producing 27 possible phenotypic combinations (Table 1). The data recorded pertains to two populations of C. stannous over 9 generations; a small population of 4 cans (Figure 1) and the…

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    6. Discuss/Explain, “in details,” the concept of the genetic drift of a population. The process of change in the genetic composition of a population due to chance or random events rather than by natural selection, resulting in changes in allele frequencies over time ("Genetic drift," 2008). The effect of genetic drift in large populations is usually negligible whereas in small populations, it predominates ("Genetic drift," 2008). In a small population, genetic drift results in some alleles…

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    Hardy and Weinberg made an equation about genetic variance of a population at equilibrium. They postulated that allele or genes should be stable or equal with no disturbing factors. For a generation be able to remain constant and reach the equilibrium within generations, they postulated about how alleles behave that acts in a population. With these assumptions, Hardy and Weinberg determined the definition of evolution within a gene pool. They defined that for an evolution would not exist within…

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