Genetic drift

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  • Genetic Drift: A Mechanism Of Evolution

    Genetic drift is a mechanism of evolution that occurs by random chance rather than natural selection. In genetic drift, a population experiences a change in the frequency of a given allele, prompted by random luck rather than a need for adaptation. This differs from natural selection, in which allelic frequency is altered based on the fittest genes surviving to reproduce and the weaker genes dying off. Genetic drift tends to be a phenomenon amongst smaller populations, while natural selection holds sway in larger populations. Life (168) Genetic drift can also occur through a random sampling error. A sampling error occurs when a sample exhibits different results than the entire population would. For example, say there are fifty red worms and fifty white worms in a population, and scientists randomly select ten worms to observe. Because the sample is smaller, the alleles passed on in the group of ten may not even out as they would in a group of one hundred. Also, if the group contains more red worms than white, the presentation of alleles in the offspring will be skewed. There are two types of genetic drift; there is a population bottle neck effect and the founder effect. The population bottle neck effect is when a population greatly decreases in size due to some random ecological event and the small population has a greater chance of genetic variation. The founder effect is a variation of the bottle neck effect in which a small portion of a larger population to branch off or…

    Words: 360 - Pages: 2
  • Mechanisms Of Evolution: Genetic Drift And Natural Selection

    The mechanisms of evolution are mutation, gene flow, genetic drift and natural selection. These mechanisms are based upon the changes that occur within an organism’s gene pool and how they affect those organisms and their survivability. Some of these mechanisms of evolution move quickly and affect large populations while others are slow moving and affect small populations. Not all of the evolutionary mechanisms are positive and benefit the population’s long term survival. Commonly these negative…

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  • The Four Forces Of Natural Selection And Genetic Drift

    The four forces of evolution include natural selection, mutation, gene flow, and genetic drift. Natural selection is the foremost force in evolution. It states that biological traits which increase survival will become more frequent in each subsequent generation. It is the most prominent force in evolution because members of a population that inherit these traits live longer, and produce more offspring. Another force of evolution is mutation, the only cause of new genetic material. A mutation is…

    Words: 402 - Pages: 2
  • Mutations, Natural Selection, Genetic Drift, And Gene Flow

    . The four forces of evolution are mutations, natural selection, genetic drift, and gene flow. Mutations are changes in genes that make us who we are today. Mutations, although they are changes in our genetic code, are most of the time harmless and essential to evolution. Mutations can be either advantageous, deleterious, or neutral depending on what the environment of the living organism is (class lecture, Wednesday). The next force of evolution is natural selection which is the idea that…

    Words: 310 - Pages: 2
  • The Four Forces Of Evolution, Genetic Drift, And Natural Selection

    The four forces of evolution are mutation, gene flow, genetic drift, and natural selection (Wwnorton). What I understand about mutation is that it is a random change that sometimes is good or bad. Whenever I hear the word mutation I automatically think of the X-Men because they were labeled as mutants and had random mutations happen to them. What I know about gene flow right now is that its when properties from one party flows to the other party that did not have that property. In my mind…

    Words: 290 - Pages: 2
  • Four Forces Of Evolution: Genetic Drift, And Natural Selection

    The four forces of evolution are mutation, gene flow, genetic drift, and natural selection. Mutation is when a change happens during replication of DNA. It is when the copy of the original DNA is not replicated completely correctly. There are multiple types of mutation including substitution, deletion, duplication, insertion, nonsense mutations, missense mutation, frameshift, and repeat expansion. Another force of evolution, gene flow, also called migration is exactly that.…

    Words: 449 - Pages: 2
  • Four Forces Of Evolution: Mutations, Genetic Drift, And Natural Selection

    The four forces of evolution include mutation, gene flow, genetic drift, and natural selection. Mutation occurs when the base pairs in DNA change which leads to different codons being read during translation. Most mutations create codons for the same amino acid that the normal codon would have made but sometimes a different amino acid is made and that leads to changes in the organism's phenotype. Gene flow happens when two different populations come together and reproduce with each other. The…

    Words: 297 - Pages: 2
  • Genetic Drift Papers

    Genetic Drift is chance rise and fall in the regularity of the arrival of a gene in a tiny remote population, apparently owing to coincidental rather than normal selection. Usually, genetic drift takes place in very small inhabitants, where rarely occurring alleles face a better opportunity of being absent. Once it starts, genetic drift will carry on up until the allele involved is missing by the inhabitants or up until it is the lone allele existing in a population at a specific locus. Genetic…

    Words: 518 - Pages: 3
  • The Concepts Of Hardy-Weinberg Equilibrium And Natural Selection

    is 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…

    Words: 1241 - Pages: 5
  • Mportance/Significance Of The Hardy-Weinberg Law Case Study

    for evolution to occur ("SparkNotes: population genetics," 2014). The conditions set up by the…

    Words: 1806 - Pages: 8
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