To assess which statement is NOT true about migration as an agent of evolutionary change, let's evaluate each option:
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The migrants must be able to interbreed with members of the resident population in order to bring about lasting evolutionary change to the population.
- This statement is true. For migration to lead to evolutionary change via gene flow, the migrants need to be able to interbreed with the resident population.
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The alleles brought by migrants may be selected against and will eventually disappear from the population.
- This statement is also true. Migrant alleles can face selection pressures and may indeed be selected against, causing them to decrease or disappear over time.
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Many migrants must arrive simultaneously to bring about evolutionary change to the population.
- This statement is NOT necessarily true. While a larger number of migrants can have a more significant effect on genetic diversity and allele frequency, it is not a requirement for migration to cause evolutionary change. A small number of migrants can still influence the population, albeit possibly to a lesser extent.
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The arrival of migrants often increases the genetic diversity of the population.
- This statement is true. Migration typically introduces new alleles into the population, which can enhance genetic diversity.
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All of the above statements are true.
- Since we have identified that the statement regarding the necessity of many migrants is not necessarily true, this collective statement is also false.
Based on this analysis, the statement that is NOT true about migration as an agent of evolutionary change is:
Many migrants must arrive simultaneously to bring about evolutionary change to the population.
1 answer