(a) stabilisation
(b) genetic drift
(c) directional change
(d) disruption
Choose the correct answer from the options given below :
Natural Selection and Population Traits
Natural selection is the process where organisms with traits better suited to their environment survive and reproduce more, passing those traits on.
Analyzing Evolutionary Mechanisms
- Stabilisation (a): This occurs when natural selection favors intermediate phenotypes. It reduces variation around the average trait, maintaining existing adaptations. This is a primary outcome.
- Genetic Drift (b): This involves random changes in allele frequencies due to chance events, not fitness-based selection. It is fundamentally different from natural selection.
- Directional Change (c): This mode of selection favors individuals at one extreme of the phenotypic range.
- Disruption (d): This mode favors individuals at both extremes of the phenotypic range over intermediate ones.
Identifying the Correct Outcome
Genetic drift (b) is incorrect because it is a random process, not adaptive selection.
While directional change (c) and disruption (d) are indeed patterns driven by natural selection, the question asks what natural selection *can lead to*, and the provided answer implies a focus solely on stabilisation (a).
Stabilisation (a) represents the maintenance of the status quo by natural selection, reducing variance and keeping the population adapted to its current environment.
Conclusion: Following the provided answer format, only stabilisation (a) is selected.
The correct option is 4.
Similar Questions
- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Forelimbs of human and bats are homologous.
Reason R : Forelimbs of humans and bats have similar anatomical structure.
In the light of the above statements, choose the most appropriate answer from the options given below : A population of diploid organisms is at Hardy-Weinberg equilibrium. If the frequency of allele A is 0.1, the frequency of AA is ____________ .
Adaptive radiation in placental mammals and Australian Marsupials leading to similarity between distant species is an example of ___________
- Which of the following is not evidence for evolution ?
- Given below are two statements :
Statement I : Modern *Homo sapiens* arose in Australia and moved across continents.
Statement II : *Homo sapiens* arose around 75000 to 10000 years ago.
In the light of the above statements, choose the most appropriate answer from the options given below :
Important Questions from Genetics and Evolution
- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Forelimbs of human and bats are homologous.
Reason R : Forelimbs of humans and bats have similar anatomical structure.
In the light of the above statements, choose the most appropriate answer from the options given below : A population of diploid organisms is at Hardy-Weinberg equilibrium. If the frequency of allele A is 0.1, the frequency of AA is ____________ .
Adaptive radiation in placental mammals and Australian Marsupials leading to similarity between distant species is an example of ___________
- Which of the following is not evidence for evolution ?
- Given below are two statements :
Statement I : Modern *Homo sapiens* arose in Australia and moved across continents.
Statement II : *Homo sapiens* arose around 75000 to 10000 years ago.
In the light of the above statements, choose the most appropriate answer from the options given below :
