Multiple Choice
Which of the following best explains why the percentage of mosquitoes resistant to DDT increased rapidly after the pesticide was introduced?
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1. Introduction to Biology
Natural Selection and Evolution
Multiple Choice
During times of environmental change, populations with genetic ______ have a better chance of adapting.
A
variation
B
drift
C
uniformity
D
fixation
Verified step by step guidance1
Understand the concept of genetic variation: Genetic variation refers to the differences in DNA sequences among individuals within a population. It is the foundation for evolution and adaptation, as it provides the raw material for natural selection to act upon.
Consider the role of environmental change: During times of environmental change, populations must adapt to new conditions to survive. Adaptation often requires traits that are better suited to the new environment, which arise from genetic variation.
Evaluate the options provided: Analyze each term in the context of adaptation. 'Variation' refers to differences in genetic makeup, 'drift' refers to random changes in allele frequencies, 'uniformity' implies lack of genetic diversity, and 'fixation' refers to the dominance of a single allele in a population.
Determine which term best supports adaptation: Populations with genetic variation have a diverse pool of traits, increasing the likelihood that some individuals possess advantageous traits for survival in changing environments. Other options, such as 'uniformity' or 'fixation,' reduce diversity and adaptability.
Conclude that genetic variation is the correct answer: Populations with genetic variation are better equipped to adapt to environmental changes, as they have a wider range of traits that may be beneficial under new conditions.
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