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The body sizes of individuals of a population of frogs on a remote island were measured and found to be normally distributed (Gaussian). After several years with severe winters, the mean body size was found to have significantly increased, although the distribution remained normal (Gaussian).
These results can be interpreted to mean that body size is under
  • a)
    Directional selection
  • b)
    Stabilizing selection
  • c)
    Disruptive selection
  • d)
    Group selection
Correct answer is option 'A'. Can you explain this answer?
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The body sizes of individuals of a population of frogs on a remote isl...
Explanation:

  • The change in mean body size towards larger individuals suggests directional selection.

  • In directional selection, individuals with traits that are further away from the population average are favored by the environment. This leads to a shift in the mean value of the trait towards the favored direction over time.

  • In this case, the severe winters may have favored larger-bodied individuals, as they were better able to survive and reproduce in the harsh conditions.

  • The fact that the distribution remained normal suggests that the selection pressure was not strong enough to cause a significant deviation from normality.

  • If stabilizing selection were occurring, the mean body size would remain stable, as individuals with intermediate body sizes would be favored over those with extreme sizes.

  • If disruptive selection were occurring, individuals with extreme body sizes would be favored over those with intermediate sizes, leading to a bimodal distribution.

  • Group selection refers to the idea that selection can occur at the level of the group, rather than just the individual. This is not relevant to this scenario.



Hence, the correct answer is option A, directional selection.
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The body sizes of individuals of a population of frogs on a remote island were measured and found to be normally distributed (Gaussian). After several years with severe winters, the mean body size was found to have significantly increased, although the distribution remained normal (Gaussian).These results can be interpreted to mean that body size is undera)Directional selectionb)Stabilizing selectionc)Disruptive selectiond)Group selectionCorrect answer is option 'A'. Can you explain this answer?
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The body sizes of individuals of a population of frogs on a remote island were measured and found to be normally distributed (Gaussian). After several years with severe winters, the mean body size was found to have significantly increased, although the distribution remained normal (Gaussian).These results can be interpreted to mean that body size is undera)Directional selectionb)Stabilizing selectionc)Disruptive selectiond)Group selectionCorrect answer is option 'A'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about The body sizes of individuals of a population of frogs on a remote island were measured and found to be normally distributed (Gaussian). After several years with severe winters, the mean body size was found to have significantly increased, although the distribution remained normal (Gaussian).These results can be interpreted to mean that body size is undera)Directional selectionb)Stabilizing selectionc)Disruptive selectiond)Group selectionCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The body sizes of individuals of a population of frogs on a remote island were measured and found to be normally distributed (Gaussian). After several years with severe winters, the mean body size was found to have significantly increased, although the distribution remained normal (Gaussian).These results can be interpreted to mean that body size is undera)Directional selectionb)Stabilizing selectionc)Disruptive selectiond)Group selectionCorrect answer is option 'A'. Can you explain this answer?.
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