The diagram given below represents the operation of natural selection on different trails. Choose the correct option.
- Disurptive
- Directional
- Stabilising
- Stabilising & Directional Both
- Directional and Disruptive
The Correct Option is
Solution and Explanation
More individuals acquire worth other than the mean character value as a result of a directional shift brought about by natural selection. As a result of the disruption caused by natural selection, more people gain peripheral character value at both extremities of the distribution curve. When one particular characteristic or phenotype is chosen above another, this is known as directional selection. The allele frequency tends to tilt more in one way due to the selection pressure favoring one characteristic. The trait distribution is such that the graphs have a propensity to lean to one side. When the two extreme qualities are preferred without taking the intermediate feature into account, disruptive/diversifying selection takes place. The pattern of the trait distribution places the higher peaks on the extreme and a lower curve on the middle.
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Concepts Used:
Evolution and Natural Selection
Charles Darwin - was a British naturalist who proposed the theory of biological evolution by natural selection. Darwin derived evolution as "descent with modification," the idea that species change gradually, give rise to new species and share a common ancestor. Darwin had proposed natural selection - the mechanism for evolution. Because resources are short in nature, organisms with heritable traits that favor survival and reproduction will lean to leave more offspring than their peers, causing the traits to rise in frequency over generations. The consequence of natural selection on populations is to become adapted, or increasingly well-suited, to their environments steadily. Natural selection entirely depends on the environment and needs existing heritable variation in a group.
Read More: Types of Natural Selection