Genetics and Biotechnology: Evolution and Selection
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Questions and Answers

What is the primary mechanism underlying genetic drift?

  • Non-random mating between individuals
  • Mutation rates varying between populations
  • Selection pressure from environmental factors
  • Random fluctuation of allele frequencies over time (correct)

Which of the following scenarios is an example of the Founder Effect?

  • A population of cattle is domesticated and bred for specific traits
  • A small group of individuals from a large population establish a new population (correct)
  • A natural disaster reduces the size of a population
  • A large population of dogs is divided into two smaller populations

What is the term for the extreme reduction in population size, resulting in a loss of genetic diversity?

  • Natural selection
  • Artificial selection
  • Genetic drift
  • The Bottleneck Effect (correct)

Which of the following is a characteristic of genetic drift in small populations?

<p>Random fluctuation of allele frequencies over time (B)</p> Signup and view all the answers

What is the primary difference between genetic drift and natural selection?

<p>Genetic drift is a random process, while natural selection is directional (D)</p> Signup and view all the answers

What is the primary mechanism for accumulating adaptive differences in populations according to natural selection?

<p>Gradual accumulation of beneficial mutations (C)</p> Signup and view all the answers

What is the term for the loss of genetic variation in a population due to a drastic reduction in population size?

<p>Bottleneck effect (D)</p> Signup and view all the answers

What is the term for the random change in allele frequency in a small population?

<p>Genetic drift (D)</p> Signup and view all the answers

What is the primary difference between genetic drift and natural selection?

<p>Genetic drift is random, while natural selection is directional (C)</p> Signup and view all the answers

What is an example of a 'natural laboratory of evolution' where natural selection and genetic drift have been studied?

<p>The Galápagos Islands (C)</p> Signup and view all the answers

What is the primary reason why genetic drift has a more significant impact on small populations?

<p>Because small populations are more susceptible to genetic drift due to their limited gene pool (D)</p> Signup and view all the answers

What is an example of a bottleneck effect?

<p>A severe reduction in population size due to a natural disaster (C)</p> Signup and view all the answers

How does genetic drift differ from natural selection?

<p>Genetic drift is random, while natural selection is directional (D)</p> Signup and view all the answers

What is the founder effect, and how does it relate to genetic drift?

<p>The founder effect is a type of genetic drift, and it decreases genetic diversity (D)</p> Signup and view all the answers

What is the key difference between genetic drift and gene flow?

<p>Genetic drift changes allele frequencies over time, while gene flow changes the gene pool (B)</p> Signup and view all the answers

What is the primary mechanism by which genetic drift leads to the loss of genetic variation in small populations?

<p>Random sampling of alleles from one generation to the next (C)</p> Signup and view all the answers

Which of the following is an example of the bottleneck effect?

<p>A small group of individuals that survive a natural disaster (C)</p> Signup and view all the answers

What is the main difference between genetic drift and natural selection?

<p>Genetic drift is a directional force, while natural selection is a random force (B)</p> Signup and view all the answers

What is the founder effect?

<p>The creation of a new population from a small group of individuals (A)</p> Signup and view all the answers

Which of the following evolutionary processes is most likely to lead to the fixation of a neutral allele in a population?

<p>Genetic drift (A)</p> Signup and view all the answers

What is the consequence of inbreeding on genotype frequencies in a population?

<p>A deviation from Hardy-Weinberg equilibrium (C)</p> Signup and view all the answers

Which of the following conditions is required for Hardy-Weinberg equilibrium?

<p>Random mating (B)</p> Signup and view all the answers

What is the effect of self-fertilization on the frequency of alleles in a population?

<p>A reduction in the frequency of heterozygotes (D)</p> Signup and view all the answers

What is the term for the random change in allele frequencies in a small population?

<p>Genetic drift (C)</p> Signup and view all the answers

Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

<p>Gene flow between populations (B)</p> Signup and view all the answers

What is the primary driver of the accumulation of biological differences between two populations that were once part of a single species?

<p>Natural selection (B)</p> Signup and view all the answers

What happens to a population when it experiences a severe reduction in size, resulting in a loss of genetic diversity?

<p>Genetic drift increases (B)</p> Signup and view all the answers

What is the term for the formation of a new population from a small group of individuals, which can lead to genetic drift?

<p>Founder Effect (C)</p> Signup and view all the answers

What is the key difference between genetic drift and natural selection?

<p>Genetic drift is a directional force, while natural selection is a random process (C)</p> Signup and view all the answers

What is the term for the random fluctuations in allele frequency that occur in small populations?

<p>Genetic Drift (C)</p> Signup and view all the answers

What can be a consequence of a bottleneck effect in a population?

<p>Increased susceptibility to disease outbreaks (A)</p> Signup and view all the answers

What is the primary difference between the genetic drift that occurs in large populations versus small populations?

<p>The rate of genetic drift is slower in large populations (B)</p> Signup and view all the answers

Which of the following is an example of a genetic drift event?

<p>A population of 10 individuals that is split into two groups of 5 (D)</p> Signup and view all the answers

What is the primary difference between genetic drift and natural selection?

<p>Genetic drift is a random process, while natural selection is a directional process (D)</p> Signup and view all the answers

What is the term for the genetic drift that occurs when a few individuals colonize a new habitat?

<p>Founder effect (B)</p> Signup and view all the answers

What is the relationship between the population size and the effect of genetic drift?

<p>The effect of genetic drift is smaller in large populations (C)</p> Signup and view all the answers

What is the primary consequence of the bottleneck effect in the cheetah population?

<p>Increased susceptibility to disease outbreaks (A)</p> Signup and view all the answers

What is the term for the random change in allele frequency in a small population?

<p>Genetic drift (B)</p> Signup and view all the answers

What is the primary difference between the genetic drift that occurs in a population affected by a bottleneck effect and the genetic drift that occurs in a population affected by a founder effect?

<p>The bottleneck effect leads to a loss of genetic variation, while the founder effect leads to a gain of genetic variation (B)</p> Signup and view all the answers

What is the relationship between the frequency of an allele in a population and the effect of genetic drift?

<p>The effect of genetic drift is smaller for alleles with high frequencies (A)</p> Signup and view all the answers

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