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Species and Evolution

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Species and Evolution
Rasmussen College
Dana Voicinco
G156/BSC1548 Section 02 Human Biology - Online –
2016 Winter Quarter

A species is defined as a group of organisms, which, under natural conditions, tend to interbreed and produce fertile offspring. A species is the biggest gene pool possible under natural conditions. If we look different does not mean we belong to different species. Organisms may appear to be alike and be different species, or may look different and be considered the same species. Racial differences are just phenotypic differences between subgroups of human species, but there are no barriers to reproduction, and we are considered the same species. For example, many bacteria reproduce mainly asexually. The bacterium is reproducing asexually, by binary fission. The definition of a species as a group of interbreeding individuals cannot be easily applied to organisms that reproduce only or mainly asexually.
Genes are what code for the traits of an organism, and the offspring inherits at least some of the genes from the parent. Genes are the portions of an organism's DNA that carry the code responsible for building that organism in a very specific way. From generation to generation, molecular mechanisms reshuffle, and alter genes in a way that produces genetic variation. Without genetic variation, the basic mechanisms of evolutionary change cannot operate.
Natural selection is one of the basic mechanisms of evolution. Natural selection encourages changes in the gene pool. Living organisms interact with their local environments and some live long enough to reproduce and some do not. The organisms that fit the environment are more likely to survive and reproduce. Movement of individuals in or out of the population affects differences in the gene pool of a particular population. Geographical redistribution of gene flow tends to mix pools of genes that might not otherwise mix. Individuals who are better able to find and use a food resource will live longer and produce more offspring than those who are less successful at finding food. Inherited traits that increase individuals' fitness are then passed to their offspring, giving the offspring the same advantages. Natural selection is the result of variation, differential reproduction, and heredity.
Every form of life on Earth interacts over time with other organisms, and with its physical environment. For that reason, the evolution of one species influences the evolution of species with which it coexists by changing the natural selection pressures those species face. Coevolution is happen when different species have close ecological interactions with one another. When populations of different species come together to form a community, they often depend on each other in some way for survival or to make life easier. This is especially apparent in food webs and food chains and in particular predator and prey relationships. If one of these species were to change, other species may also need to change. For example, us like humans altered the course of evolution on land but we have also effectively reduced the size of fishes in the sea. Mans prefer to catch big fishes, but fishing regulations prohibit the harvest of the smallest individuals of a species. In response, fishes have evolved the ability to reproduce at a smaller size or younger age. If they can breed before they get big enough to be harvested their genes stand a much higher chance of being passed on.
Evolution does not stop once a species becomes a species. Every population of living organisms is undergoing some sort of evolution, but the degree and speed of the process varies from one group to another. Populations that experience a major change in environmental conditions, evolve much more quickly than do populations in a more stable set of conditions. This is because evolution is driven by natural selection, and because when the environment changes, selective pressures change, favoring one portion of the population more heavily than it was favored before the change.

References
All about speciation. (2015, June). Retrieved from http://evolution.about.com/od/macroevolution/a/All-About-Speciation.htm
Fischetti, V. A. (Ed.). (n.d.). Understanding evolution. Retrieved from http://evolution.berkeley.edu/evolibrary/article/evo_41
Human biology: Concepts and current issues (7th ed.). (2017). Retrieved from https://online.vitalsource.com/#/books/9781323132937/cfi/46!/4/2/40/8/12/4@0:0

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