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Directional selection favors one extreme phenotype, leading to a shift in the population's trait distribution.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Darwinism Lamarckism and Modern Synthetic Theory
Directional selection shifts population mean toward one extreme when environment changes, favoring novel phenotype such as larger beaks during drought or dark coloration during pollution. It increases frequency of alleles promoting favored extreme, decreasing opposite extreme, driving adaptation and potentially speciation. Peppered moth and Darwin's finches exemplify. This mode is common during colonization or climate change. Therefore it favors Shift in mean, producing evolutionary trend. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSI
Ref: Campbell Biology, Evolution Chapters, Selection Types.
Directional selection shifts population mean toward one extreme when environment changes, favoring novel phenotype such as larger beaks during drought or dark coloration during pollution. It increases frequency of alleles promoting favored extreme, decreasing opposite extreme, driving adaptation and potentially speciation. Peppered moth and Darwin's finches exemplify. This mode is common during colonization or climate change. Therefore it favors Shift mean, producing evolutionary trend. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-N
Ref: Hartl & Clark, Principles of Population Genetics, Drift and Effective Size.
Directional selection shifts population mean toward one extreme when environment changes, favoring novel phenotype such as larger beaks during drought or dark coloration during pollution. It increases frequency of alleles promoting favored extreme, decreasing opposite extreme, driving adaptation and potentially speciation. Peppered moth and Darwin's finches exemplify. This mode is common during colonization or climate change. Therefore it favors Shift in mean trait value, producing evolutionary trend. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET,
Ref: Futuyma, Evolution, 4th ed., Chapter 11: Natural Selection.
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