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Natural Selection: Applying Darwin's Theory Of Evolution

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All creatures on Earth change relentlessly to adapt and survive in a new environment. Human beings are not an exception to this rule. Evolution by Hall and Hallgrimson had stated that Darwin’s theory of evolution is a change in genetic traits of biological population from one generation to another. The dominant, or adaptable genes will replace the recessive genes in the gene segment. The whole process of evolution, however, does not happen rapidly. It takes time, possibly one million year and beyond, depending on the species and living condition. So, what made all of the changes happen? Natural Selection. Darwin had used this mechanism of change over time to explain his theory of evolution. This definition paper will compare natural selection …show more content…

In addition, every animal is a link in the food chain. Losing one of these links could damage the harmony in nature, leading to the ecological imbalance. Nonetheless, artificial selection totally differs from natural selection. Artificial selection includes the involvement of human. Scientists and farmers breed plants or animals with desirable characteristics to produce new species, fulfilling human needs. Moreover, this idea of selection tends to occur in domestic population and produce the diversity of organisms which is different from native generations. According to Berkeley.edu, “due to fishing regulations dictating that only the largest fish may be kept, humans artificially select fish to produce smaller size fish. Originally there was great variation in fish size. As the population was fished, only large fish were removed, while smaller fish remained. Small fish reproduce and produce more small fish. Population will continue to decrease in size so long as the largest fish are harvested.” On the other hand, in natural selection, natural changes in the environment play an active role in the process. This takes a lot of time and produces a great biological

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Fishermen over fished the cod population till 99.9% was gone. Fishing laws were placed to stop fishing in order to allow for the Cod population to occur. Carroll states even though there were laws to protect the codfish but the effect of overfishing still is present. Overfishing made the overall codfish size smaller.

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Natural selection the changing based on the environment, this produces an organism that is better suited to the environment. Some reasons for adaption of individual organelles include physical environments; precipitation and soil conditions or for biological reasons; diseases, competitors, or animals wanting to eat them. Natural selection will take many individual mutations that have been create due to a threat to be transferred to the rest of a species in a given environment. This creates genetically distinct populations known as ecotypes. Natural selection is acting on random variation that chooses the most favorable and inheritable mutation, these organelles will increase their chance to survive and to reproduce.

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Changes will occur in DNA mutations which is in the gene and this will pass from one generation to another. These affects could change an organisms appearance, how their body works and their behavior. Therefore, the new versions of a gene survives better than the old version and that animal will have more offspring and will inherit new version of the gene, which will pass on to their young ones. How natural selection is one of the key processes in evolutionary change? Natural selection is one of the key process and leads to evolutionary change when individuals that have a certain characteristics have a greater survival rate than the other organisms in a population, which passes these genes to their offsprings later on.

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What is natural section? Natural selection is the process where organisms that can adapt to their environment tend to survive and produce more offspring. This process was discovered and proven by scientist Charles Darwin during the mid-1800’s. This process is key to science because it explains the central idea of how nature is designed. Natural selection is a key component to life on Earth.

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If the Human species is able to select and adapt to the changes most useful to him, then why should nature fail in selecting variation and adapting under the changing conditions of life in the same way as man? What laws are there in place to stop this power of adaptation and change that exist during the long ages, which rigidly scrutinize the whole system, structure and, habits of every living organism which favours the fit and kills of the weak or unstable? The answer is that there is no limit to the extent of natural selection or in fact evolution as a whole by the fact that every living organism is able to slowly adapt to form the most complex relation of life. The theory of natural selection exists within the forms of climate, geographical regions and atmospheric

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Evolution is very difficult and time-consuming process, all of the living things are subject to evolution from the moment of their appearance on the Earth. living beings are adjusted to the conditions of the environment in order to obtain food, shelter and survive. There are four fundamental Mechanisms of Evolution Natural Selection is the main evolutionary process, as a result of which the number of individuals with the maximum fitness (the most favorable signs) increases in the population, while the number of individuals with unfavorable signs decreases. In the process of natural selection from generation to generation individuals with changes even minor, but useful in certain environmental conditions, are predominantly preserved and

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It is talked about today that Darwin discovered the theory of evolution. Darwin's theory of evolution stated that individuals within a species vary from one another, variation is in some part heritable so that variant forms have offsprings that resemble them, and that different variants leave different number of offspring. Darwin then proceeded to elaborate on the mechanism of evolution by suggesting that in the universal struggle for life, nature "selects" those individuals who are best suited (fittest) for the struggle, and these individuals in turn reproduce more than those who are less fit, thus changing the composition of the population. In addition to natural selection, Darwin also suggested that species also evolve through the complementary process of sexual selection. According to Darwin, in sexual selection, one gender of a species develops a

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In Origin of Species, Darwin emphasizes the importance of ordinary selection – the battle for life based on environmental hardships governed by nature– on the development of species. He then establishes the idea of sexual selection – the struggle for the organism to reproduce generally governed by the female – which generally produces traits that ordinary selection would not develop. After 12 years he expands on the subject of sexual selection in Descent of Man, Darwin elaborates on the energy both the male and female exert on reproduction. This energy establishes that while ordinary selection enforces animals to change and adapt to the physical environment around them, sexual selection focuses on the environment of reproduction allowing

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Darwin believes it is. Variations that give one species an advantage, no matter how slight, over another species, allow organisms a better chance of surviving and therefore of leaving more offspring. While breeders can select variations that are beneficial for them, omniscient nature has the power to develop and select variations that are imperceptible to man and beneficial to species in ways that man might never have considered. Nature can make any slight advantage increase an organism’s likelihood of surviving over another, and since these advantageous variations are heritable, they can be perpetuated in future generations. Conversely, nature can also limit species by not bestowing advantageous characteristics on them, therefore making the

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Darwin’s theory of natural selections has been used to explain the biology of animals as well as humans. This theory goes along with the statement survival of the fittest. In some ways it’s a type of mechanism that resembles artificial selection. Through a degree some behaviors or qualities become frequent within a population through a number of generations and other sets of traits start disappearing. These units that happened to be transforming are the genes.

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Destruction and changed habitat force fish to endure new environmental conditions, forcing evolution (Faulks et al. 2010). When dams block rivers, fish above the dam become residents and have decreased populations. In Hokkaido, Morita et al. (2009) show the dams cause habitat fragmentation. This causes changes in populations of white-spotted charr (Salvelinus leucomaenis) (Morita et al. 2009).

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Animals with more undesirable traits would either not survive or pass along these less desirable traits to its offspring who may or may not survive as well as other animals with better traits. Evolution is a process driven by competition between individuals for available resources and the natural selection of the fittest and most capable over the weakest. The combination of natural selection and evolution creates animals that change with the external environments in which they

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Certain species have a huge impact to an ecosystem, but even the smallest fish could have the biggest impact. Overfishing occurs when more fish are caught than the population can replace through natural reproduction (overfishing). The results not only affect the balance of life in the oceans, but could also affect the coastal areas that depend on fish for their way of life. For centuries, our seas and oceans seem to be considered a limitless food supply. But that is not the case, increasing fishing efforts over the last fifty years as well as unjustifiable fishing practices are pushing many fish stocks to the point of extinction.

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He says that, “We can not select genes that are not in the gene pool of the species.” For example there is no gene for wings in the gene pool of a pig. Would you expect to see a new born pig with a growing set of wings? No, because it is not in it’s DNA. This is what natural selection is proposing.

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