What effect does disruptive selection have on a trait in a population?

What effect does disruptive selection have on a trait in a population?

Disruptive selection occurs when both extreme traits are favored in an environment. Disruptive selection increases genetic and phenotypic diversity in a population, since more than one phenotype, or physical trait, is favored. As a result, disruptive selection is sometimes called diversifying selection.

What effect does disruptive selection have on phenotypes?

Disruptive selection increases genetic variation by favoring alleles corresponding to more extreme phenotypes (Box 1 Figure Ic), resulting in a genetic polymorphism with heterozygote disadvantage.

What is the result of disruptive selection on genetic variation?

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. The result of this type of selection is increased genetic variance as the population becomes more diverse.

How does disruptive selection affect evolutionary change?

Disruptive selection can lead to speciation, with two or more different species forming and the middle-of-the-road individuals being wiped out. Because of this, it’s also called “diversifying selection,” and it drives evolution.

What happens to the mean in disruptive selection?

Disruptive selection can lead to a bimodal distribution of trait values and therefore can result in an increase in the variance of a trait without a change in its mean.

What is disruptive selection quizlet?

disruptive selection. form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle. directional selection.

What causes directional selection?

Directional selection occurs when individuals homozygous for one allele have a fitness greater than that of individuals with other genotypes and individuals homozygous for the other allele have a fitness less than that of individuals with other genotypes.

Can disruptive selection lead to new species?

Disruptive Selection and Speciation Disruptive selection can lead to speciation, with two or more different species forming and the middle-of-the-road individuals being wiped out. Because of this, it’s also called “diversifying selection,” and it drives evolution.

What is the effect of disruptive selection quizlet?

Disruptive selection eliminates phenotypes near the average value and favors extreme phenotypes. When disruptive selection occurs, the overall amount of genetic variation in the population is maintained.

What are some examples of disruptive selection?

Peppered moths: One of the most studied examples of disruptive selection is the case of ​London’s peppered moths. In rural areas, the peppered moths were almost all a very light color.

Does disruptive selection increase variation?

Disruptive Selection Increases Variation. Under disruptive selection, individuals with extreme values for a trait have greater reproductive success than individuals with intermediate values. Because the values for the trait in the resulting population are further from the population mean, the variation of the trait is increased.

Which statement describes disruptive selection?

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 is disruptive selection example?

Disruptive Selection Definition. Disruptive selection is an evolutionary force that drives a population apart.

Examples of Disruptive Selection. Darwin’s finches,or Galapagos finches,are a group of finches that inhabit the long chain of islands known as the Galapagos,famously visited by Charles Darwin.

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