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.
When two or more extreme phenotypes are favored over an intermediate phenotype?
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.
When one extreme phenotype is favored over all of the others it is called?
Disruptive selection occurs when both extreme phenotypes are favored, while individuals with intermediate phenotypes are selected against by something in nature.
What kind of selection favors the intermediate phenotype while eliminating the extremes?
Stabilizing selection is the opposite of disruptive selection. Instead of favoring individuals with extreme phenotypes, it favors the intermediate variants. Stabilizing selection tends to remove the more severe phenotypes, resulting in the reproductive success of the norm or average phenotypes.
Which type of natural selection occurs when both extreme phenotypes are selected against?
Stabilizing selection occurs when phenotypes at both extremes of the phenotypic distribution are selected against. This narrows the range of variation.
When a phenotype with a higher fitness is at one end of the phenotypic range?
Directional selection occurs when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end. The range of phenotypes shifts because some individuals are more successful at surviving and reproducing than others.
When environmental pressures favor individuals at both extremes of the phenotypic range it is known as?
Disruptive or Diversifying selection
occurs when natural selection favors both extremes of continuous variation. Over time, the two extreme variations will become more common and the intermediate states will be less common or lost. Disruptive selection can lead to two new species.
Which mode of selection operates when individuals at both extremes of the distribution have the highest fitness?
Disruptive selection: Both extreme phenotypes have a higher fitness than intermediate phenotypes.
Which type of selection favors individuals with intermediate phenotypes and selects against individuals with extreme phenotypes quizlet?
During stabilizing selection, the intermediate phenotype is favored and becomes more common in the population. Disruptive selection occurs when both extreme phenotypes are favored, while individuals with intermediate phenotypes are selected against by something in nature.
When the environment favors extreme types in a population at the expense of intermediate forms this is an example of which category of natural selection?
Another type of natural selection is disruptive selection. Here, the environment favors extreme types in a population at the expense of intermediate forms, thereby splitting the population into two or more subpopulations.
Which type of selection causes a reduction in the median phenotype?
Stabilizing selection favors the middle phenotype, causing the decline in variation in a population over time.
What phenotypes are favored in directional selection?
The directional selection theory says that an extreme phenotype (characteristics or traits) is favored over other phenotypes and this causes the allele frequency (how often the variant of a gene shows up in a population) to shift over time in favor of the extreme phenotype.
What is selected during natural selection?
What is “selected” during natural selection? … Individuals with certain advantageous traits are selected, in the sense that they produce the most offspring. c. Advantageous traits are selected, in the sense that they become more common in the population over time.
Which type of selection maintains stable frequencies?
For example, if heterozygotes at a locus have higher fitness than homozygotes (a scenario known as heterozygote advantage or overdominance), natural selection will maintain multiple alleles at stable equilibrium frequencies.
When the norm of a population is selected against and the extremes are selected for this is known as?
When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection.