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Get Answers to all your Questions
- #Genetics and Evolution
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Assertion: Mutations are the primary source of genetic variation in populations.
Reason: Genetic variation arises only through mutations and not through other mechanisms such as gene flow or genetic drift.
Assertion and reason are both true, and reason is an accurate account of assertion.
Both assertion and reason are accurate, but reason does not adequately explain assertion.
The assertion is correct, but the reasoning is incorrect.
Both the assertion and reason are incorrect.
Answers (1)
Genetic variation in populations is mostly caused by mutations. The evolution of species depends on genetic variation, and mutations are what introduce new genetic variations into the population.
Natural selection, genetic drift, and gene flow can all alter a population's genetic composition, but they do not produce new genetic variations. Gene flow is the exchange of genes between populations, genetic drift is the erratically fluctuating frequency of genes within a population, and natural selection acts on already-existing genetic variations to increase their frequency within a population. Genetic variety therefore only occurs through mutations and not through other mechanisms like gene flow or genetic drift. Mutations are the only source of new genetic variants.
Option 1 is the correct answer.
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