Stabilizing Selection in Natural Selection
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Questions and Answers

What is the primary criterion for defining a biological species according to the Biological Species Concept?

  • Geographical distribution of populations
  • The ability to interbreed under natural conditions (correct)
  • Genetic differences between populations
  • Physical similarity between individuals

    • What is the primary difference between S.magna and S.neglecta, despite their similar body shape and coloration?

  • Behavioral differences (correct)
  • Genetic differences
  • Geographical distribution
  • Physiological differences

    • Which of the following modes of speciation occurs when a new species emerges from a single population within the same geographic area?

  • Allopatric speciation
  • Adaptive radiation
  • Genetic drift
  • Sympatric speciation (correct)

    • What is the term for the process of reproductive isolation between populations?

    <p>Reproductive isolation</p> Signup and view all the answers

    What is the term for the process by which a single species radiates into multiple new species, often due to environmental pressures?

    <p>Adaptive radiation</p> Signup and view all the answers

    What is the effect of stabilizing selection on the population?

    <p>Reduce in genetic variability</p> Signup and view all the answers

    Which of the following is an example of stabilizing selection?

    <p>Human birth weight</p> Signup and view all the answers

    What happens to the number of individuals with extreme phenotypes in a population under stabilizing selection?

    <p>They decrease in number</p> Signup and view all the answers

    Why do underweight babies have a lower survival rate in a population under stabilizing selection?

    <p>They are prone to illness</p> Signup and view all the answers

    What is the reason for the survival of intermediate-sized lizards in a population?

    <p>They are well-adapted to the environment and can defend their territory</p> Signup and view all the answers

    What is the primary characteristic of individuals favoured by stabilizing selection?

    <p>They have an intermediate phenotype</p> Signup and view all the answers

    Which of the following is a mechanism of sympatric speciation in plants?

    <p>Polyploidy</p> Signup and view all the answers

    What is the result of non-random mating in sympatric speciation?

    <p>Reduced gene flow</p> Signup and view all the answers

    What is the primary cause of sympatric speciation?

    <p>Reproductive barrier/isolation</p> Signup and view all the answers

    What happens to a small population in sympatric speciation?

    <p>It becomes a new species</p> Signup and view all the answers

    What is the outcome of sympatric speciation?

    <p>A new species is established</p> Signup and view all the answers

    What is the key characteristic of sympatric speciation?

    <p>Overlap of geographical areas</p> Signup and view all the answers

    What is the role of genetic drift in speciation and evolution?

    <p>It plays an important role in speciation and evolution.</p> Signup and view all the answers

    What is an example of the founder effect?

    <p>A few members of a population being blown by a storm to a new island</p> Signup and view all the answers

    What is a characteristic of the F2 generation of hybrids?

    <p>They fail to develop or are infertile</p> Signup and view all the answers

    What is a factor that can contribute to genetic drift?

    <p>Geographical barrier</p> Signup and view all the answers

    Why is the allele causing Ellis-Van Creveld Syndrome more common in the Old Order Amish community in Pennsylvania?

    <p>Because the Amish population was founded by a small group of individuals who carried the allele</p> Signup and view all the answers

    What is the term for the reduction of a population size due to environmental factors, leading to genetic drift?

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

    What is the primary effect of genetic drift on a population?

    <p>Reduces the overall genetic variability</p> Signup and view all the answers

    What is the outcome of genetic drift on a population's allele frequencies?

    <p>Can lead to the loss or fixation of alleles</p> Signup and view all the answers

    In which type of population does genetic drift have the greatest impact?

    <p>Small populations</p> Signup and view all the answers

    What can genetic drift cause to happen to an allele?

    <p>Become eliminated from a population</p> Signup and view all the answers

    What drives the changes in allele frequencies due to genetic drift?

    <p>Random chance events</p> Signup and view all the answers

    What is the result of genetic drift on the Hardy-Weinberg equilibrium?

    <p>It shifts the equilibrium</p> Signup and view all the answers

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