Stabilizing selection example Stabilizing selection commonly uses negative selection (a. k. If natural selection favors an average phenotype by selecting against extreme variation, the population will undergo stabilizing selection. Instead of favoring individuals with extreme phenotypes, it favors the intermediate variants. Aug 24, 2022 · Stabilizing Selection. So, no organism is perfectly adapted to its environment. Stabilizing selection: Stabilizing selection occurs when the population stabilizes on a particular trait value and genetic diversity decreases. Nov 21, 2023 · Learn the stabilizing selection definition, about stabilizing natural selection in evolution, and stabilizing selection examples. Instead, it makes the peak of the bell curve even higher than what would be considered normal. There are numerous examples of stabilizing selection in nature. For example, plant height might be acted on by stabilizing selection. Stabilizing selection is a common phenomenon observed in various natural settings. Thus, natural selection is constantly influencing the evolution of species. In the graph above, the x-axis May 11, 2022 · Stabilizing Selection. For example, in a population of mice that live in the woods, natural selection will tend to favor individuals that best blend in with the forest floor and are less likely to be spotted by predators. Stabilizing selection When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection. Stabilizing selection is one of three main types of natural selection in evolution. Stabilizing selection is the Jun 20, 2018 · Stabilizing selection is a descriptive term for what happens to an individual trait when the extremes of the trait are selected against. Updated: 11/21/2023 Table of Contents Jan 15, 2021 · Natural selection is a pressure that causes groups of organisms to change over time. Stabilizing selection is a type of natural selection that favors intermediate phenotypes over extremes. Stabilizing selection can be thought of as a powerful force that drives a trait toward the phenotypic mean. . See examples of stabilizing selection in mice and peppered moths. Jan 1, 2022 · Schmalhausen states that stabilizing selection guards the phenotypic norm from being altered and reestablishes the phenotypic norm when it has been disturbed (Schmalhausen 1949). In a population of mice that live in the woods, for example, natural selection is likely to favor individuals that best blend in with the forest floor and are Mar 28, 2025 · Evolution - Natural, Sexual, Artificial: Natural selection can be studied by analyzing its effects on changing gene frequencies, but it can also be explored by examining its effects on the observable characteristics—or phenotypes—of individuals in a population. Jun 20, 2018 · Learn what stabilizing selection is and how it affects the traits of living things. If plants are too short, they may struggle to receive adequate sunlight for photosynthesis. In other words, stabilizing selection tends to maintain the status quo, preserving the existing characteristics of a population rather than pushing them toward extremes. This does not skew the bell curve in any way. Dec 19, 2023 · Stabilizing selection is a form of natural selection that favors intermediate or average traits in a population. Nov 23, 2024 · Learn how stabilizing selection decreases genetic variance by favoring an average phenotype. The others are directional and diversifying selection. purifying selection) to select against extreme values of the character. Learn how it works, see its graph, and explore examples of human birth weight, coat coloration, plant height, cactus spine density, and clutch size in robins. Stabilizing favors those that lie between the extremes. Nov 23, 2024 · Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations. A Simple Definition and Prominent Examples of Stabilizing Selection. Extreme sizes, whether too large or too small, can lead to disadvantages such as increased predation risk Sep 20, 2019 · The most common of the types of natural selection is stabilizing selection. Stabilizing Selection. Stabilizing Selection Examples: Some examples of stabilizing selection are given below: Robin Eggs: In the case of the number of robin eggs, these are selected with the help of stabilizing selection. a. Stabilizing selection is the opposite of disruptive selection. Dec 19, 2023 · Stabilizing selection, a form of natural selection, favors the intermediate or average traits within a population. Stabilizing selection is the process by which the intermediate form of a trait in an organism is selected and given preference over the extreme forms of that same trait, in order to maintain that common and adapted form in the population. Several factors can cause stabilizing selection including: Predation where predators feed on extreme traits and spare the average; Coloration (camouflage) in environment; Resource allocation; Food type; The effect of stabilizing selection is to reduce variation in a population so that all Dec 16, 2021 · If natural selection favors an average phenotype by selecting against extreme variation, the population will undergo stabilizing selection. Other examples of stabilizing selection are the birth weight of humans and the number of eggs a bird lays (clutch size). If natural selection favors an average phenotype, selecting against extreme variation, the population will undergo stabilizing selection (Figure 1). Learn how it differs from directional and disruptive selection, and see examples of stabilizing selection in humans, rats and plants. Stabilizing selection is a form of natural selection that favors the intermediate phenotypes of a population and reduces genetic diversity. However, Nov 21, 2024 · Examples of Stabilizing Selection in Nature. In a mouse population that live in the woods, for example, natural selection is likely to favor mice that best blend in with the forest floor and are less likely for predators to spot. See examples of stabilizing selection in robin eggs, lemurs, and insects, and how it differs from other forms of selection. In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes. What is an example of stabilizing selection? Gall flies laying eggs in developing shoots of the tall goldenrod. Distribution scales of phenotypic traits such as height, weight, number of progeny, or longevity typically show greater numbers of 稳定选择是自然选择的一种类型，即中间表型为选择所厚，而极端表型为选择所薄，结果一切偏离“正常”的、与共同的表现型不一致的类型都被排斥，仅保留中间表型的个体，使生物类型保持相对稳定。 Nov 3, 2023 · Stabilizing selection helps maintain the balance between survival and reproductive success by selecting for traits that are well-suited to the current environmental conditions. Learn how it works, its history, its influence on population structure, and its analysis with examples from humans, plants, insects, and cacti. In stabilizing selection, the median phenotype is the one selected for during natural selection. A plant that is too short may not be able to compete with other plants for sunlight. This increases the frequency of the trait in the population, and the alleles and genes which help form it. Nov 5, 2017 · Stabilizing selection is a type of natural selection that favors a non-extreme trait in a population. An example of stabilizing selection can be explained by using the number of eggs found in a robin’s nest. Jan 19, 2019 · Classic examples of traits that resulted from stabilizing selection include human birth weight, number of offspring, camouflage coat color, and cactus spine density. The typical number of eggs laid by a robin is four. One example of stabilizing selection is observed in the height of plants. In Stabilizing Selection, individuals who deviate far from the ‘norm’ or average are selected against. Jul 13, 2024 · Stabilizing selection is a fundamental concept in evolutionary biology, representing a type of natural selection where intermediate phenotypes are favored over extreme ones. If natural selection favors an average phenotype, selecting against extreme variation, the population will undergo stabilizing selection (Figure \(\PageIndex{1}\)). Learn how it differs from directional and disruptive selection, and see examples of stabilizing selection in plants, humans and birds. Stabilizing Selection When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection. Here are a few examples: Body Size in Mammals: Many mammal species exhibit stabilizing selection on body size. Stabilizing selection is a form of natural selection where the average individuals within a population are favored and proliferate as the environment selects against individuals with extreme phenotypes or mutations. Nov 5, 2017 · Because most traits do not change drastically over time, stabilizing selection is considered to be the most common mechanism for natural selection. Oct 31, 2019 · In this way, stabilizing selections are caused by many traits which are an entire group of animals share, known as Synapomophies. Animals inherit their genetics from their parents or ancestors, and the environment is constantly changing. Sep 4, 2017 · Schmalhausen states that stabilizing selection guards the phenotypic norm from being altered and reestablishes the phenotypic norm when it has been disturbed (Schmalhausen 1949). rtkqam jyet uselh qprv novmh xdrj gsatgl xaoapws yaxpr fhrqy fvxjt rxsut djcs eqytlv ijzv