Consider the Following Two Scenarios: 1)A Flash-Flood Sweeps Through an Area

question 12

Multiple Choice

Consider the following two scenarios: 1) A flash-flood sweeps through an area and random lemmings are killed,resulting in a change in lemming phenotype in subsequent generations;2) A flash-flood sweeps through an area and some lemmings are able to survive because they are able to hold their breath longer than other lemmings,resulting in a change in lemming phenotype in subsequent generations.What are the primary differences between the two scenarios?

• A)Scenario 1 represents genetic drift because changes in the population were not adaptive,while Scenario 2 represents natural selection because some individuals were better adapted than other individuals.
• B)Scenario 1 represents natural selection because changes in the population were adaptive,while Scenario 2 represents genetic drift because changes in the population were due to higher fitness of some individuals.
• C)Both scenarios represent genetic drift because the flash-flood is a random event.
• D)Both scenarios represent natural selection because some individuals survived in each scenario.

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Definitions:

Limbic System

A group of interconnected brain structures responsible for regulating emotions, memory, and arousal responses.

Emotions

Complex psychological states that involve physiological arousal, feelings, cognitive processes, and behavioral reactions.

Memory

The ability of the mind to store and recall information, experiences, and perceptions, which is fundamental to learning and adaptation.

Commissural Fibers

Bundles of nerve fibers that connect corresponding parts of the two hemispheres of the brain.