What is intermediate selection?

What is intermediate selection?

This type of natural selection occurs when there are selective pressures working against two extremes of a trait and therefore the intermediate or “middle” trait is selected for.

Which type of selection acts to eliminate individuals which are intermediate on a phenotypic range?

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 type of selection would favor individuals of intermediate rather than extreme sizes?

Natural selection could be stabilizing. The average members of the population, with intermediate body sizes, may have higher fitness than the extremes. Natural selection could favor both extremes over the intermediate types.

What are the types of disruptive selection?

Disruptive selection is a type of natural selection that selects against the average individual in a population. The makeup of this type of population would show phenotypes (individuals with groups of traits) of both extremes but have very few individuals in the middle.

What are the 4 types of selection?

There are several ways selection can affect population variation:

  • stabilizing selection.
  • directional selection.
  • diversifying selection.
  • frequency-dependent selection.
  • sexual selection.

Which type of selection acts to eliminate individuals at only one of the extremes of a phenotypic range?

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.

What is an example of stabilizing selection?

Stabilizing selection in evolution is a type of natural selection that favors the average individuals in a population. Classic examples of traits that resulted from stabilizing selection include human birth weight, number of offspring, camouflage coat color, and cactus spine density.

What are the different types of selection?

How many types of selection are there?

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population. The downward arrows point to those phenotypes against which selection acts.

What is the most common type of selection?

stabilizing selection
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 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 is an example of intersexual selection?

Intersexual selection occurs as a result of interactions between males and females of a species. One sex, typically males, will develop and display traits or behavior patterns to attract the opposite sex. Examples of such traits include plumage on birds, the mating calls of frogs, and courtship displays in fish.

What is intermediate state selection in biology?

A type of selection that removes individuals from both ends of a phenotypic distribution, thus maintaining the same distribution mean. occurs when natural selection favors the intermediate states of continuous variation. Over time, the intermediate states become more common and each extreme variation will become less common or lost.

What is disruptive selection in biology?

Disruptive selectionDisruptive Selection: 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.

What is an example of selective selection in biology?

Example: Giraffes with the longest necks are able to reach more leaves to each. Selective pressures will work in the advantage of the longer neck giraffes and therefore the distribution of the trait within the population will shift towards the longer neck trait.

What is altruistic selection in biology?

A type of selection that involves altruistic behavior, e.g., the protection of offspring, in which a parent acts to preserve the gene pool of offspring at the expense of itself. occurs when natural selection favors a trait that benefits related members of a group.