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Stabilizing selection, which acts against both extreme phenotypes and favors intermediate variants. Hence the narrowing of the bell curve in the middle.

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15y ago

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What does a Graph look like showing phenotype distributions for stabilizing selection?

A normal curve. A Bell curve.


When individuals at only one end of the bell curve of phenotype frequencies have fitness?

directional selection


When individuals at only one end of a bell shaped curve of phenotype frequencies have high fitness the results is?

Directional Selection.


When individuals at only one end of the bell curve of phenotype frequencies have high fitness the result is?

Directional selection, where individuals with phenotypes at one extreme of the bell curve have a higher fitness compared to others. This can result in a shift in the population towards that extreme phenotype over generations.


What is the difference between directional and disruptive selection?

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.


What type of selection always results in the narrowing of the bell curve distribution of alleles?

Directional selection always results in the narrowing of the bell curve distribution of alleles. This occurs when individuals at one extreme of the phenotypic range have a higher fitness, causing the frequency of the alleles associated with that extreme to increase in the population over time.


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