Table of Contents
- 1 What phenotype is selected against in stabilizing natural selection?
- 2 What is directional stabilizing and disruptive selection?
- 3 What phenotypes are selected against?
- 4 Which type of selection decreases overall phenotypic variation in a specific trait?
- 5 What is stabilizing selection in biology?
- 6 Which type of natural selection favors both extremes over the intermediate phenotype?
- 7 How does natural selection affect the distribution of phenotypes?
- 8 Which is the most common type of selection?
- 9 When does natural selection favor the bimodal distribution?
What phenotype is selected against in stabilizing natural selection?
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.
What is directional stabilizing and disruptive selection?
Classical, population-level theory proposes that natural selection can act in three different ways or “modes” upon a functional trait: directional (individuals with values at one end of the functional trait are favored), stabilizing (individuals with intermediate trait values are favored), or disruptive (both ends are …
Which type of selection favors individuals with intermediate phenotypes and selects against individuals with extreme phenotypes quizlet?
During stabilizing selection, the intermediate phenotype is favored and becomes more common in the population. Disruptive selection occurs when both extreme phenotypes are favored, while individuals with intermediate phenotypes are selected against by something in nature.
What phenotypes are selected against?
Stabilizing selection occurs when phenotypes at both extremes of the phenotypic distribution are selected against.
Which type of selection decreases overall phenotypic variation in a specific trait?
The most common form of stabilizing selection is based on phenotypes of a population. In phenotype based stabilizing selection, the mean value of a phenotype is selected for, resulting a decrease in the phenotypic variation found in a population.
What do stabilizing selection and disruptive selection have in common?
What do stabilizing selection and disruptive selection have in common? They both decrease genetic variation. Under which condition would a mutation have the most impact on allele frequency? A flood kills most of the population of ants that live near a river.
What is stabilizing selection in biology?
Stabilizing selection (not to be confused with negative or purifying selection) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value. This means that most common phenotype in the population is selected for and continues to dominate in future generations.
Which type of natural selection favors both extremes over the intermediate phenotype?
Disruptive
Disruptive or Diversifying selection occurs when natural selection favors both extremes of continuous variation. Over time, the two extreme variations will become more common and the intermediate states will be less common or lost. Disruptive selection can lead to two new species.
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.
How does natural selection affect the distribution of phenotypes?
Modes of selection: Natural selection acts in 3 ways on the distribution of phenotypes (Fig. 23.11) Stabilizing selection: an intermediate phenotype is favored → reduced phenotypic variation Directional selection: one end of a phenotypic distribution is favored → shifts the mean phenotype
Which is the most common type of selection?
Azcolvin429 (Selection_Types_Chart.png) / GFDL. The most common of the types of natural selection is stabilizing selection. In stabilizing selection, the median phenotype is the one selected for during natural selection.
Which is the best description of stabilizing selection?
Stabilizing selection is the type of natural selection that human skin color follows. Most humans are not extremely light skinned or extremely dark skinned. The majority of the species fall somewhere in the middle of those two extremes.
When does natural selection favor the bimodal distribution?
A type of selection that removes individuals from the center of a phenotypic distribution and thus causes the distribution to become bimodal. occurs when natural selection favors both extremes of continuous variation. Over time, the two extreme variations will become more common and the intermediate states will be less common or lost.