What type of selection favors individuals with an extreme value of a trait and selects against both average individuals and individuals at the opposite extreme?

Table of Contents

• 1 Which type of selection favors both extremes of an individuals trait?
• 2 When both extremes are favored over the common median trait this is called?
• 3 When the intermediate phenotype is favored the extreme phenotypes are being selected?
• 4 When two or more extreme phenotypes are favored?

Which type of selection favors both extremes of an individuals trait?

Disruptive selection
Disruptive selection favors both extreme phenotypes, different from one extreme in directional selection.

What is favored in stabilizing selection?

Stabilizing selection is the opposite of disruptive selection. Instead of favoring individuals with extreme phenotypes, it favors the intermediate variants. This means that most common phenotype in the population is selected for and continues to dominate in future generations.

What are two ways variation in the trait could be introduced into the population?

For a given population, there are three sources of variation: mutation, recombination, and immigration of genes. However, recombination by itself does not produce variation unless alleles are segregating already at different loci; otherwise there is nothing to recombine.

When both extremes are favored over the common median trait this is called?

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.

In which type of selection are intermediate traits favored over more extreme variations of a trait?

(or disruptive) selection
Diversifying (or disruptive) selection: Diversifying selection occurs when extreme values for a trait are favored over the intermediate values.

Which type of selection occurs when 2 extreme phenotypes are advantageous?

disruptive selection
Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.

When the intermediate phenotype is favored the extreme phenotypes are being selected?

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 are two ways that variation can be describe?

Variations are classified either as continuous, or quantitative (smoothly grading between two extremes, with the majority of individuals at the centre, as height varies in human populations); or as discontinuous, or qualitative (composed of well-defined classes, as blood groups vary in humans).

What are the two main reasons for variation between organisms of the same species?

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

When two or more extreme phenotypes are favored?

Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.

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.

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