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Consider the following statements with reference to the Genetic Drift:
1. It takes place when the occurrence of variant forms of a gene increases or decreases by chance over time in a population.
2. Large populations are more susceptible to genetic drift than small populations.
Which of the statements given above is/are correct?
  • a)
    1 only
  • b)
    2 only
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements with reference to the Genetic Drift:...
Genetic drift, not natural selection, was recently identified as the main factor driving speciation in endangered pupfish species.
About Genetic Drift:
  • It is one of the basic mechanisms of evolution.
  • It takes placewhen the occurrence of variant forms of a genecalled allelesincreases and decreases by chance over timein a population.
  • This occurs due to random sampling and the random events that influence the survival and reproduction of those individuals.
  • These variations in the presence of alleles are measured as changes in allele frequencies.
  • Small populations are more susceptible to genetic drift than large populations, whose larger numbers can buffer the population against chance events.
  • Once it begins, genetic drift will continue until the involved allele is either lost by a population or until it is the only allele present in a population at a particular locus. 
  • Both possibilities decrease the genetic diversity of a population.
  • It could also causeinitially rare allelestobecome much more frequent, and even fixed.
  • Genetic drift is common after population bottlenecks, which are events that drastically decrease the size of a population.
  • In these cases, genetic drift can result in the loss ofrare alleles and decrease the gene pool.
  • Genetic drift can cause a new population to be genetically distinct from its original population, which has led to the hypothesis that genetic drift plays a role in the evolution of new species.
Hence only statement 1 is correct.
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Consider the following statements with reference to the Genetic Drift:1. It takes place when the occurrence of variant forms of a gene increases or decreases by chance over time in a population.2. Large populations are more susceptible to genetic drift than small populations.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'A'. Can you explain this answer?
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