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.
When two or more extreme phenotypes are favored over any intermediate phenotype This is referred to as?
Stabilizing selection. -Occurs when an intermediate phenotype is favored. -Extreme phenotypes selected against. -Individuals near the average are favored. -Most common form of selection bevause the average individual is well adapted to its environment.
When the two extreme phenotypes are selected for its called?
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.
What type of selection favors 2 or more extreme phenotypes?
Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.
When an extreme phenotype is favored in the distribution curve moves toward that extreme this would demonstrate a type of natural selection called?
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.
When the intermediate phenotype is favored the extreme phenotypes are being selected?
Stabilizing selection (left column) acts against phenotypes at both extremes of the distribution, favouring the multiplication of intermediate phenotypes. Directional selection (centre column) acts against only one extreme of phenotypes, causing a shift in distribution toward the other extreme.
When two extreme phenotypes are selected in natural selection intermediate phenotypes become?
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.
What type of selection occurs when individuals in a population with the intermediate phenotype are selected for?
bio chapter 11 retak
|what type of selection occurs when individuals in a population with the intermediate phenotype are selected for||disruptive|
|when a few individuals start a new colony it most likely results in||genetic drift through the founder effect|
What occurs when phenotypes in the middle of the range are selected against?
Disruptive selection occurs when phenotypes in the middle of the range are selected against. This results in two overlapping phenotypes, one at each end of the distribution. An example is sexual dimorphism. This refers to differences between the phenotypes of males and females of the same species.
What are extreme phenotypes?
Extreme phenotype selection is a well defined biological concept that describes how environmental pressures favour, among traits exhibiting diverse phenotypes, the fittest to overcome the hazards encountered.
What type of selection selects for the intermediate trait and selects against the two extremes?
This type of natural selection occurs when selective pressures are working in favour of the two extremes and against the intermediate trait.
Which type of selection favors both extremes of an individuals trait?
Disruptive selection favors both extreme phenotypes, different from one extreme in directional selection.
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.
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 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 mode of selection operates when individuals at both extremes of the distribution have the highest fitness?
Disruptive selection: Both extreme phenotypes have a higher fitness than intermediate phenotypes.