A gene pool is disturbed by which of the following?
Correct answer: D. Both A and B
- A. Emigration
- B. Immigration
- C. Pan migration
- D. Both A and B
Explanation
The correct answer is both A and B. Emigration and immigration are both forms of migration that can disturb a gene pool. Emigration involves individuals leaving a population, which can decrease genetic diversity and alter allele frequencies. Immigration involves new individuals joining a population, potentially introducing new alleles and increasing genetic diversity. In contrast, 'Pan migration' is unrelated to biological gene flow and pertains to tax processes, making it an incorrect option for this context.
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Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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