Question

Operation of natural selection on different traits can lead to all except
Stabilisation
Directional change
Disruption
Artificial selection​

Answer 1

Answer:

Stabilizing Selection

If natural selection favors an average phenotype by selecting against extreme variation, the population will undergo 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. Assuming the ground is a fairly consistent shade of brown, those mice whose fur is most-closely matched to that color will most probably survive and reproduce, passing on their genes for their brown coat. Mice that carry alleles that make them slightly lighter or slightly darker will stand out against the ground and will more probably die from predation. As a result of this stabilizing selection, the population’s genetic variance will decrease.

Directional Selection

When the environment changes, populations will often undergo directional selection, which selects for phenotypes at one end of the spectrum of existing variation. A classic example of this type of selection is the evolution of the peppered moth in eighteenth- and nineteenth-century England. Prior to the Industrial Revolution, the moths were predominately light in color, which allowed them to blend in with the light-colored trees and lichens in their environment. As soot began spewing from factories, the trees darkened and the light-colored moths became easier for predatory birds to spot.

Diversifying (or Disruptive) Selection

Sometimes natural selection can select for two or more distinct phenotypes that each have their advantages. In these cases, the intermediate phenotypes are often less fit than their extreme counterparts. Known as diversifying or disruptive selection, this is seen in many populations of animals that have multiple male mating strategies, such as lobsters. Large, dominant alpha males obtain mates by brute force, while small males can sneak in for furtive copulations with the females in an alpha male’s territory. In this case, both the alpha males and the “sneaking” males will be selected for, but medium-sized males, which cannot overtake the alpha males and are too big to sneak copulations, are selected against.

Explanation:

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Answer 2

Question:

Operation of natural selection on different traits can lead to all except -

1.Stabilisation.

2.Directional change.

3.Disruption.

4.Artificial selection​.

Concept:

Natural selection:

It is a process of adapting new favorable characters depending upon enviromental changes.

Answer:

Operation of natural selection on different traits can lead to all except - 4.Artificial selection​.

Explanation:

Natural selection includes stabilisation (stabilizes on a particular non-extreme trait value), directional change(an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that particular phenotype) and disruption selections(selects against the average individual in a population).

So first three options are defintely are not the answers.

Artificial selection is a human made process so it's not related to the natural selection and it is the right answer.

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