Natural Selection and Genetic Drift

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What is natural selection?

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Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

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What is genetic drift?

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Genetic drift is a mechanism of evolution that refers to random changes in allele frequencies in a population, particularly significant in small populations.

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How does genetic drift affect small populations?

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It has a larger effect because each individual represents a larger fraction of the gene pool.

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What is evolution?

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Evolution is the change in the genetic composition of a population over time.

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What is the founder effect?

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The founder effect occurs when a small group of individuals leaves a larger population to establish a new population, leading to reduced genetic diversity.

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What is the bottleneck effect?

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The bottleneck effect is a drastic reduction in population size that can lead to changes in allele frequencies and reduced genetic diversity.

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What role does variation play in natural selection?

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Variation provides the raw material for natural selection, as different traits can affect an organism's survival and reproduction.

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What is adaptation?

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Adaptation is a trait that increases an organism's fitness in its environment, often resulting from natural selection.

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How did Charles Darwin contribute to the understanding of natural selection?

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Charles Darwin proposed the theory of natural selection based on his observations of species variation and adaptation, particularly in the Galapagos finches.

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What is the significance of allele frequencies in a population?

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Allele frequencies indicate how common a particular allele is in a population, influencing genetic diversity and evolutionary processes.