Which line in the figure below most accurately shows the relative fitness of different-size gametes? Blue

What type of selection do you expect given the relative fitness of differently-sized gametes? diversifying

Question

Which line in the figure below most accurately shows the relative fitness of different-size gametes? Blue

What type of selection do you expect given the relative fitness of differently-sized gametes? diversifying

BlackTom AI · Accepted Answer

To determine which line best represents how fitness varies with gamete size, we need to compare how each line responds as size increases from small (left) to large (right).
Option: Blue line
- Observation: The blue line shows high fitness at the small-size end, then a dip toward intermediate sizes, and then a rise again toward large sizes. This creates a U-shaped pattern, indicating that both very small and very large gametes have relatively higher fitness than intermediate-sized gametes.
- Interpretation: A U-shaped (diversifying) fitness pattern means selection favors the extremes (very small and very large gametes) over mid-sized ones. In evolutionary terms, this aligns with diversifying selection, where extreme phenotypes have higher fitness than the intermediate phenotype.
Option: Diversifying (the question asks which type of selection is expected given the relative fitness)
- Interpretation: Since the blue line suggests high fitness for the two ends of the size spectrum (small and large) and comparatively lower fitness for intermediate sizes, the mode of selection is diversifying, not stabilizing or directional.
- Contrast with other possible interpretations: If a line showed consistently increasing fitness with size, that would indicate directional selection toward larger gametes. If a line showed consistently decreasing fitness with size, that would imply directional selection toward smaller gametes. If a line showed higher fitness only at the middle sizes, that would indicate stabilizing selection. The blue line uniquely fits the diversifying pattern by elevating fitness at both extremes.
Thus, selecting the Blue line corresponds to the diversifying type of selection in the second part of the question, with the line’s shape supporting the idea that extreme gamete sizes have higher relative fitness than intermediate sizes.

Which line in the figure below most accurately shows the relative fitness of different-size gametes? Blue What type of selection do you expect given the relative fitness of differently-sized gametes? diversifying多重下拉选择题

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