What is meant by stabilizing selection?

What is meant by stabilizing selection?

Stabilizing selection (not to be confused with negative or purifying selection) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value. This means that most common phenotype in the population is selected for and continues to dominate in future generations.

What is stabilizing selection in evolution?

stabilizing selection: a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value.

What could cause 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.

What is stabilizing selection example?

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 is directional selection give an example?

An example of directional selection is fossil records that show that the size of the black bears in Europe decreased during interglacial periods of the ice ages, but increased during each glacial period. Another example is the beak size in a population of finches.

What are examples of stabilizing selection?

Classic examples of traits that resulted from stabilizing selection include human birth weight, number of offspring, camouflage coat color, and cactus spine density.

What are some examples of stabilizing selection?

What is an example of stabilizing selection?

What is the difference between stabilizing and disruptive selection?

Other types of natural selection include stabilizing and disruptive selection. 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 are the two types of balancing selection?

Classic examples are known in humans and other organisms, and two different forms of balancing selection are very familiar—heterozygote advantage at a locus (often called overdominance), and frequency-dependent selection with a rare-allele advantage (although overdominance is often incorrectly used as synonymous with …

Which is the best definition of stabilizing selection?

Stabilizing selection (not to be confused with negative or purifying selection) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value.

What happens to a bell curve during stabilizing selection?

It’s more or less a bell curve, with mostly intermediate phenotypes but also some extreme phenotypes at both ends of the spectrum. When stabilizing selection occurs, phenotypes at both extremes are selected against, and intermediate phenotypes are selected for. The bottom graph shows that the curve has become narrower and taller.

How does stabilizing selection cause the narrowing of phenotypes?

Stabilizing selection causes the narrowing of the phenotypes seen in a population. This is because the extreme phenotypes are selected against, causing reduced survival in organisms with those traits.

How does natural selection reduce variation in a trait?

Natural selection will reduce phenotypic variation in a trait subject to stabilizing selection either by reducing the genetic variation in the alleles coding for that trait (e.g., removing deleterious mutations) or by reducing the magnitude of the alleles’ effects (termed canalization).