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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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TaigaStabilizing 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.
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.
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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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.
What concept of microscopy deals with the ability of the specimen to stand out against its background?
Contrast in microscopy refers to the ability of the specimen to be distinguished from its background. Techniques such as staining, phase contrast, and differential interference contrast (DIC) microscopy can enhance contrast in microscopy.
Is barium a contrast medium?
Yes, barium is a contrast medium and is actually one of the most common of the contrast mediums used in enemas and other x-ray based tests. Iodine is another contrast medium that is quite common.
What are two ways to label your contrast media on the back table?
You can label contrast media by writing the patient's name and identification number on the label provided with the contrast media or by affixing a pre-printed sticker with the necessary information onto the contrast media container.
Example of actor ligand and spectator ligand?
An example of an actor ligand is ethylenediamine in the coordination of metal ions, as it directly binds to the metal center and influences the reactivity of the complex. In contrast, an example of a spectator ligand is water in the coordination sphere of a metal complex, as it does not directly participate in the reactivity of the complex but is present as a stabilizing ligand.
