Compare And Contrast Evolution And Artificial Selection

Livan Martell PID: 4635791 PCB 3043 10/05/2017 Weekly Assignment: 4 October 2017 1) Compare and contrast evolution by artificial selection and natural selection. (Ch. 7) Natural selection is an essential process of evolution proposed by Charles Darwin and generally accepted by the scientific community as the best explanation for the adaptation and specialization of organisms. Artificial selection is a technique of reproductive control by which man alters the genes of domestic or cultivated organisms. This technique is based on the inheritable characteristics of the species, increasing the frequency with which certain variations appear in the following generations; there is a directed evolution, in which human preferences determine the†¦show more content†¦Evolution has led to the approval of new species and others have disappeared throughout the planet; today, a great diversity of organisms of different species can be seen throughout the ecosystems, some are in danger of extinction. The artificial selection causes the species to no longer compete naturally, so this leads to degradation and disappearance of the species. Natural selection is the basis of all evolutionary change. It is the process through which, the best-adapted organisms displace the less adapted ones by the slow accumulation of favorable genetic changes in the population during th e generations. The importance is that natural selection is one of the main mechanisms of evolution, since this favors or disadvantages the survival of certain species, to achieve survival need to adapt to their environment and the changes they produce. 2) How should stabilizing and disruptive selection affect the magnitude of phenotypic variation from one generation to the next? (Ch. 7) Stabilizing selection favors intermediate phenotypes within a range. The extremes of the variations are selected against. Children weighing significantly less than or equal to 3.4 kg have higher rates of infant mortality. The selection works against both extremes. In this type of selection, the intermediate phenotypes are favored and radical phenotypes are eliminated at both ends of a continuum of variation. Disruptive selection is a type of natural selection, ie ThereShow MoreRelatedQuiz 2 Bio 100 Essay1157 Words   |  5 PagesEVOLUTION and NATURAL SELECTION (30 pts) a. What is a mutation? Provide 3 examples of different mutations causing specific diseases in human population. For each example explain what kind of mutation that is (ie. A point substitution,   a chromosomal duplication etc). Mutation is a genetic mistake(s) that occur during DNA replication. 1. Progeria accelerated aging; mutation in the LMNA gene 2. Hypertrichosis excessive hair on the shoulders, face and ears; implicate it to a rearrangementRead MoreEvolutionary bio essay for final2859 Words   |  12 Pages 2) Evolution can be defined as change in allele frequencies over time. 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