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Stabilizing selection is where a population is favored by just the right amount of a certain trait, and if they don't have the right amount of that certain trait then they die.

Example: Human babies and birth weight, if the baby is too small, i gets sick. If the baby is too big, it cannot get through the pelvis; but just the right weight and it will come out lively and well.

Disruptive selection is when an animal has to fit in with its environment; I.E., camouflage.

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13y ago
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5mo ago

Stabilizing selection favors the average phenotype and reduces genetic diversity by selecting against extreme traits. Directional selection favors individuals at one extreme of the phenotypic range, leading to a shift in the population's average phenotype. Disruptive selection favors individuals at both extremes of the phenotypic range, increasing genetic diversity within the population.

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11y ago

In population genetics, directional selection is a mode of natural selection in which a single phenotype is favored, causing the allele frequency to continuously shift in one direction. With stabilizing selection genetic diversity decreases as the population stabilizes on a particular trait value. Diversifying selection describes changes in population genetics in which extreme values for a trait are favored over intermediate values.

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11y ago

I'm not sure what "stabilizing directional" selection is, but if you get out a bell curve graph...

Stabilizing selection tends to select for individuals around the average, or mean, of a population, which technically makes the curve steeper. Directional selection shifts the average in one direction (shifts the whole curve in one direction). Disruptive selection creates two new averages, which means it splits the one curve into two, smaller, separate curves.

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Q: Compare and contrast stabilizing directional and disruptive selection?
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Stabilizing selection reduces variation in a trait by favoring the intermediate phenotype, leading to a narrower range of trait values over time. In contrast, disruptive selection increases variation in a trait by favoring extreme phenotypes, potentially leading to divergence into distinct subgroups with different trait values. Both types of selection can influence the evolution of a trait by shaping the distribution of phenotypic variation within a population.


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The effects of stabilizing directional and disruptive selection on variations in a trait over time?

Stabilizing selection reduces variation in a trait by favoring the intermediate phenotype, leading to a narrower range of trait values over time. In contrast, disruptive selection increases variation in a trait by favoring extreme phenotypes, potentially leading to divergence into distinct subgroups with different trait values. Both types of selection can influence the evolution of a trait by shaping the distribution of phenotypic variation within a population.


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