When phenotypes are favored at one extreme of a normal distribution?

1. Directional Selection. When one extreme phenotype is favored by natural selection, the distribution of the phenotype shifts in that direction. This type of selection is therefore called directional selection.

When phenotypes are favored at one extreme of a normal distribution selection occurs?

A type of selection that favors phenotypes at one extreme of a trait’s range is called directional selection. Directional selection occurs when one extreme phenotype is favored by natural selection. During stabilizing selection, the intermediate phenotype is favored and becomes more common in the population.

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When one extreme phenotype is favored over all of the others it is called?

In population genetics, directional selection, is a mode of negative natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.

When extreme phenotypes are favored?

Disruptive selection, also called diversifying selection, describes changes in population genetics in which extreme values for a trait are favored over intermediate values. In this case, the variance of the trait increases and the population is divided into two distinct groups.

What happens when environmental conditions favor individuals at one extreme of the normal distribution?

Directional selection

occurs when natural selection favors one extreme of continuous variation. Over time, the favored extreme will become more common and the other extreme will be less common or lost.

When an extreme phenotype is favored and the distribution curve moves toward that extreme?

Directional selection occurs when one of two extreme phenotypes is selected for. This shifts the distribution toward that extreme. This is the type of natural selection that the Grants observed in the beak size of Galápagos finches.

Which of the following types of selection favors one extreme of a phenotypic distribution?

Directional: A type of selection that favors phenotypes at one extreme of a trait’s range. Directional selection causes a shift in a population’s phenotypic distribution.

When one extreme phenotype is most successful in a population this is an example of?

The correct answer is “directional selection.” Directional selection is when, over multiple generations, an entire population shifts its phenotype towards one extreme. Stabilizing selection is when the extremes of that trait decrease in frequency compared to the less extreme phenotypes.

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When a phenotype with a higher fitness is at one end of the phenotypic range?

Directional selection occurs when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end. The range of phenotypes shifts because some individuals are more successful at surviving and reproducing than others.

Which of the following favors one phenotypic extreme over another causing a shift in the phenotypic mean?

Directional selection. The type of selection that favors phenotypes at one extreme of a trait’s range; causes a shift in a population’s phenotypic distribution; an extreme phenotype that was once rare in a population becomes more common; mean value of a trait shifts in the direction of the more advantageous phenotype.

What happens during disruptive selection?

Disruptive selection is an evolutionary force that drives a population apart. The disruptive selection will cause organsisms with intermediate traits to reproduce less, and will allow those organisms with extreme traits to reproduce more. This causes the alleles for the extreme traits to increase in frequency.

Which type of selection favors individuals with intermediate phenotypes and selects against individuals with extreme phenotypes?

Diversifying (or disruptive) selection: Diversifying selection occurs when extreme values for a trait are favored over the intermediate values. This type of selection often drives speciation. Diversifying selection can also occur when environmental changes favor individuals on either end of the phenotypic spectrum.

What is an example of disruptive selection?

Disruptive Selection Examples: Color

Light-colored oysters would blend into the rocks in the shallows, and the darkest would blend better into the shadows. The ones in the intermediate range would show up against either backdrop, offering those oysters no advantage and make them easier prey.

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When an intermediate phenotype is favored over the extreme variants it is?

Stabilizing selection

When individuals with intermediate phenotypes are favoured and extreme phenotypes are selected against, the selection is said to be stabilizing. (See the left column of the figure.) The range and distribution of phenotypes then remains approximately the same from one generation to another.

Which type of selection Favours individuals with variations at opposite extremes of a trait over individuals with intermediate variations?

Stabilizing selection is the opposite of disruptive selection. Instead of favoring individuals with extreme phenotypes, it favors the intermediate variants. Stabilizing selection tends to remove the more severe phenotypes, resulting in the reproductive success of the norm or average phenotypes.

What is a mode of natural selection that favors a phenotype at one end of a range of variation?

Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations. In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes.