Final answer:
Bright-feathered birds, by more easily attracting mates and reproducing more often, are likely to become the dominant bird in the population over time due to natural and sexual selection.
Step-by-step explanation:
In the context of natural selection, individuals with traits that provide a reproductive advantage are more likely to pass on their genes to the next generation. Therefore, in the case of the bird species where bright-feathered birds more easily attract mates and reproduce more often, these birds with the advantageous trait of brighter feathers will likely become the dominant bird in the population over time. This is because sexual selection, a type of natural selection, favors traits that enhance an organism's ability to mate and produce offspring. Traits like bright feathers in birds can lead to increased mate attraction, as seen in the example of peacocks where males with larger, brighter feathers tend to be more successful in attracting females.
Over time, as these bright-feathered birds have more offspring, the frequency of the genes associated with bright feathers will increase within the population. This process aligns with the principle of evolution, where characteristics that enhance reproductive success become more common in subsequent generations, potentially leading to the population evolving to have mostly bright-feathered individuals.