Height − Another example of a trait, that might be acted on by stabilizing selection, is plant height. A plant that is too short may not be able to compete with other plants for sunlight.
What happens during stabilizing 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 a common cause of stabilizing selection?
In that way, like all forms of selection, the cause of stabilizing selection is the increased fitness and reproductive success that the median individuals have. The extreme versions or traits have a disadvantage, in one way or another. This disadvantage, in evolutionary terms, is decreased reproduction.
Is human birth weight An example of stabilizing selection?
Birth weight is a classic example of a trait under strong stabilizing selection, where high and low birth weights are correlated with reduced survival in both males and females (22).
How are pine trees An example of stabilizing selection?
The stabilizing selection will favor the pine trees with median heightbecause they will neither be too short to be denied light by the tall ones nor too tall to break in thestorms and therefore will thrive to outgrow the pine trees extremes of height. There is a moth in England called the peppered moth.
What is an example of disruptive selection?
Disruptive Selection Examples: Color
Light-colored oysters would blend into the rocks in the shallows, and the darkest would blend better into the shadows. The ones in the intermediate range would show up against either backdrop, offering those oysters no advantage and make them easier prey.
What is stabilizing selection simple?
❍ Stabilizing selection is defined as a type of natural selection that favors the propagation of the average or intermediate phenotype in a population, while actively selecting against the extreme phenotypes. It favors the major phenotype in a population that is well adapted to the environment.
What is the difference between stabilizing and disruptive selection?
Each type of selection contains the same principles, but is slightly different. Disruptive selection favors both extreme phenotypes, different from one extreme in directional selection. Stabilizing selection favors the middle phenotype, causing the decline in variation in a population over time.
What is an example of balancing selection?
The heterozygote is resistant to the malarial parasite which kills a large number of people each year. This is an example of balancing selection between the fierce selection against homozygous sickle-cell sufferers, and the selection against the standard HgbA homozygotes by malaria.
Which among the following are applicable to stabilizing selection?
Stabilizing selection in a population acts against extremes and favors intermediate phenotypes. This refers often to heterozygous advantage, in which natural selection favors the heterozygote because it possesses benefits that homozygotes lack.
What is stabilizing selection a level biology?
Stabilising selection is natural selection that keeps allele frequencies relatively constant over generations. This means things stay as they are unless there is a change in the environment. A classic example of stabilising selection can be seen in human birth weights.
