The figure below shows the relationship between grandparent lifespan and the number of grandchildren born for grandfathers (left panel) and grandmothers (right panel).

Which of the following provides the most compelling interpretation of these data.

Question

The figure below shows the relationship between grandparent lifespan and the number of grandchildren born for grandfathers (left panel) and grandmothers (right panel).

Which of the following provides the most compelling interpretation of these data.

BlackTom AI · Accepted Answer

The question asks for the most compelling interpretation of the depicted data on grandparent lifespan and the number of grandchildren for grandfathers (left panel) and grandmothers (right panel).
Option 1: 'The different patterns for male and female grandparents provide strong support for the helpful grandmother explanation of menopause' — This choice leverages the contrasting patterns observed: grandmothers show a positive or increasing trend in the number of grandchildren with longer lifespan, consistent with the idea that longer-lived grandmothers can contribute more to family reproduction and caregiving, which under the grandmother hypothesis supports menopause as an evolved trait. The left panel for grandfathers does not show the same clear trend, aligning with a theory that grandmothers uniquely contribute to extended reproductive success in humans. This is a plausible and data-driven interpretation.
Option 2: 'The different patterns reflect different sample sizes - a larger sample size would reveal a grandfather effect' — While sample size can influence detectability, the figure already displays separate panels with N=157 for grandfathers and n=339 for grandmothers, indicating distinct sample sizes. However, the observed patterns (especially a clearer trend in grandmothers) are better explained by biological or evolutionary considerations rather than simply sample size differences. This explanation is less directly supported by the shown data.
Option 3: 'These data confirm that male humans have a longer reproductive lifespan than female humans.' — The figure relates lifespan to the number of grandchildren, not directly to reproductive lifespan per se. Moreover, the data do not provide a straightforward comparison of reproductive lifespans between sexes; in fact, the patterns in the left panel do not indicate a longer male reproductive window. This interpretation overreaches what is shown.
Option 4: 'These patterns are correlations and so nothing can be inferred from them.' — It is true that the data are correlational, but in the context of evolutionary biology and life-history theory, correlational patterns can inform competing hypotheses (e.g., grandmother effects). Saying nothing can be inferred disregards the theoretical relevance of the observed sex-specific patterns and their alignment with the grandmother hypothesis. This stance is overly cautious and ignores the plausible interpretation grounded in the data.
In summary, Option 1 is the most targeted interpretation that connects the distinct male vs. female patterning to an evolutionary explanation (grandmother effect), while the other choices either misinterpret the data, overstate what the data show, or ignore theoretical context.

The figure below shows the relationship between grandparent lifespan and the number of grandchildren born for grandfathers (left panel) and grandmothers (right panel). Which of the following provides the most compelling interpretation of these data.单项选择题

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