Scelta multipla
Which term best describes the change from more light-colored moths to more dark-colored moths in a population due to environmental changes?
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1. Introduction to Biology
Natural Selection and Evolution
Scelta multipla
Which of the following is a cause of evolutionary change?
A
Stable environment
B
Lack of mutation
C
Absence of gene flow
D
Genetic drift
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Understand the concept of evolutionary change: Evolutionary change refers to alterations in the genetic composition of a population over time. This can occur due to various mechanisms such as mutation, natural selection, genetic drift, and gene flow.
Define genetic drift: Genetic drift is a mechanism of evolution that involves random changes in allele frequencies within a population. It is more pronounced in small populations and can lead to significant evolutionary changes over time.
Compare genetic drift to other mechanisms: Unlike natural selection, which is driven by environmental pressures, genetic drift occurs randomly and is not influenced by the fitness of individuals. It can result in the loss or fixation of alleles purely by chance.
Analyze the options provided: A stable environment, lack of mutation, and absence of gene flow are not causes of evolutionary change. Genetic drift, however, is a recognized mechanism that can lead to changes in allele frequencies and drive evolution.
Conclude why genetic drift is the correct answer: Genetic drift introduces randomness into the evolutionary process, making it a valid cause of evolutionary change. The other options either prevent change or do not contribute to the mechanisms of evolution.
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