What evolutionary mechanism would explain the increased frequency of male birds with narrow, elongated tail feathers within this population?

Rationale

Sexual selection explains the increased frequency of male birds with narrow, elongated tail feathers.

Sexual selection occurs when certain traits increase an individual's chances of attracting mates, leading to a higher reproductive success for those individuals with those traits. In this case, male birds with narrow, elongated tail feathers may be perceived as more attractive by females, resulting in a greater number of offspring that inherit these traits.

A (Gene flow) YOUR ANSWER

Gene flow refers to the transfer of genetic material between populations through migration. While it can introduce new genetic variations, it does not specifically account for the increased frequency of a trait due to mate selection. In this scenario, the focused preference for tail feather length among females is not explained by gene flow, as it does not directly influence the attractiveness of these traits.

B (Sexual selection) CORRECT

This choice correctly identifies the evolutionary mechanism at work. In many species, males develop specific traits—such as elongated tail feathers—to attract females. If females preferentially choose mates based on these traits, males with more pronounced tail feathers will have better reproductive success, leading to an increased frequency of these traits in the population over generations.

C (Genetic drift) YOUR ANSWER

Genetic drift is a mechanism of evolution that involves random changes in allele frequencies within a population, particularly in small populations. While it can lead to changes in traits, it does not result from selective pressures based on mate preferences. Therefore, it cannot adequately explain why male birds with a specific trait become more frequent due to mating success.

D (Artificial selection) YOUR ANSWER

Artificial selection is the process by which humans breed individuals with desirable traits. In this context, the changes in tail feather frequency are not a result of human intervention but rather a natural occurrence based on female choice. Thus, artificial selection is not applicable to the scenario described.

Conclusion

Sexual selection plays a crucial role in the evolution of traits such as the narrow, elongated tail feathers in male birds. The preference of female birds for these specific traits drives the increase in frequency, leading to a population where such characteristics are common. Other mechanisms like gene flow, genetic drift, and artificial selection do not adequately explain this phenomenon as they lack the direct link to mate preference and reproductive success observed in sexual selection.

What evolutionary mechanism would explain the increased frequency of male birds with narrow, elongated tail feathers within this population?

Sexual selection explains the increased frequency of male birds with narrow, elongated tail feathers.

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