What is an example of a 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 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 stabilizing selection quizlet?
Stabilizing Selection. Occurs when individuals at the extremes of the range of characteristic are selected against. This means that the “average” individuals are selected for. You just studied 7 terms!
Why is stabilizing selection the most common?
Stabilizing selection is arguably the most common method of natural selection that occurs in plants and animals, as it essentially just reinforces the traits of animal populations that are already well adapted to that environment, rewarding organisms that have reliable, enduring phenotypes.
Does stabilizing selection change the mean?
Stabilizing selection reduces the amount of variation in a trait. For example, very small and very large babies are most likely to die, leaving a narrower distribution of birthweights.
What are examples of disruptive selection?
Disruptive Selection Examples: Color
- Peppered moths: One of the most studied examples of disruptive selection is the case of London’s peppered moths.
- Oysters: Light- and dark-colored oysters could also have a camouflage advantage as opposed to their medium-colored relatives.
What are the 3 types of selection?
The 3 Types of Natural Selection
- Stabilizing Selection.
- Directional Selection.
- Disruptive Selection.
What is the difference between stabilizing disruptive and directional 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.
Which is the best example of disruptive selection?
Can stabilizing selection lead to speciation?
When mating is nonselective, stabilizing selection always prevents speciation. The population starts splitting because of assortative mating, but after a few generations individuals with intermediate phenotype increase in frequency because of natural stabilizing selection.
What are some examples of natural selection?
Deer Mouse.
What is disruptive selection simple?
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 the importance of stabilizing selection?
An important result of stabilizing selection is the perfection of ontogenetic processes. Stabilizing selection accumulates hereditary changes that cause the rapid and reliable development of the constant characteristics of an adult organism that have been preserved.
What does stabilizing selection do?
Stabilizing Selection Definition. Stabilizing selection is any selective force or forces which push a population toward the average, or median trait. Stabilizing selection is a descriptive term for what happens to an individual trait when the extremes of the trait are selected against. This increases the frequency of the trait in the population,…
What is the common cause of stabilizing selection?
Simply stated, there is no common cause of stabilizing selection, besides the fact that the most average individual is selected for. 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.
Is the stabilizing selection the same as balancing selection?
Stabilizing selection is a type of selection which eliminates both extremes from an array of phenotypes while balancing selection is a number of selective processes that actively maintain multiple alleles of a gene in the gene pool of a population. So, this is the key difference between stabilizing and balancing selection.