In stabilizing selection, alleles for extreme traits decrease in frequency, while intermediate alleles dominate.
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After several generations in a plant population, the mean height μ remains unchanged but the variance σ2 of height increases significantly. Which type of selection most likely produced this pattern?
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How does directional selection affect allele frequency?
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Natural selection is the process by which certain traits become more or less common in a population due to their impact on survival and reproduction. It acts on phenotypes (observable characteristics) but affects allele frequencies (genetic makeup) in a population.
DefinitionNatural SelectionThe process by which heritable traits that increase an organism's chances of survival and reproduction become more common in a population over generations.
Phenotype: Observable characteristics of an organism
Allele Frequency: Proportion of a specific allele in a population
AnalogyThink of natural selection like a filter: only the traits that help an organism survive and reproduce pass through to the next generation.
This process is fundamental to evolution, driving adaptation and shaping the diversity of life on Earth.
