Which organism is B more closely related to, D or E?

Question

BlackTom AI · Accepted Answer

To determine which organism B is more closely related to, we need to consider the pattern of shared ancestry shown in the phylogenetic relationships among B, D, and E.

Option 1: 'B is equally closely related to D and E.' This would be true only if B shared a more recent common ancestor with D and E at the same time, meaning D and E diverged from B at identical points in the evolutionary tree. In many typical diagrams, that equal closeness is not the case, so this statement is unlikely unless the tree explicitly shows symmetric branching around B.

Option 2: 'E' suggests that B shares a more recent common ancestor with E than with D. If the diagram shows B and E branching from a common node more recently than either does with D, this option would be supported. However, without that specific pattern, this choice would be incorrect.

Option 3: 'D' implies that B and D share a more recent common ancestor than B and E. If the tree shows B and D diverging from a common node after B’s lineage split from E’s lineage, then B is more closely related to D. This would be the correct interpretation when the branching order places D nearer to B than E is, in terms of shared evolutionary history.

In phylogenetic reasoning, the key is to examine where the lineages join on the tree: the closer the join point to B, the more closely related the two organisms are. If the diagram indicates that B and D share a more recent node than B and E, it follows that B is more closely related to D. Conversely, if the most recent shared node for B and E is younger than that with D, E would be the closer relative. If the diagram shows simultaneous, equal branching for D and E with respect to B, option 1 would be plausible, but that scenario is not typically the default reading unless specified.

Given the provided answer set and typical interpretations of such questions, the option naming D as the closer relative aligns with the scenario where B shares a more recent common ancestor with D than with E. The other options either attribute equal closeness without evidence, or attribute closeness to E, which would require a tree pattern that favors B–E proximity.

Which organism is B more closely related to, D or E?单项选择题

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