Which species is closest to C based on the following phylogenetic tree?

Question

BlackTom AI · Accepted Answer

To determine which species is closest to C on the given phylogenetic tree, we examine the branch distances from C to its neighboring branches.
Option A: 'Species B, D and E are equally distant from C' would be true only if B, D, and E shared the same immediate branching distance from C. Looking at the tree, C is directly connected to a node that also connects to D and E in a separate clade, but the distances to B differ due to the extra internal branch leading to B. Therefore, this statement overstates equality and is not correct.
Option B: 'The closest is species E' asserts E is closer to C than others. On the diagram, E is not the closest neighbor to C; D sits on a branch that is closer to C than E because D shares a more proximate branching point with C prior to any longer branches to other groups. Hence, E is not the closest.
Option C: 'The closest is species B' would require B to be the immediate neighbor to C. However, B is attached to a separate branch that diverges earlier or later than the branch to D, resulting in a larger path length from C to B compared with the path to D. Therefore, B is not the closest.
Option D: 'The closest is species D' corresponds to the visual evidence on the tree: the branch leading to D attaches to the same recent node as C, making the path from C to D shorter than to the other options. The topology shows C and D sharing a common ancestor more recently than with B, E, or others, indicating D is the nearest neighbor.
In summary, the comparison of branch lengths and the topology indicates that D is the closest to C, while A, B, and E fail to match the actual proximity depicted by the branching pattern. The option stating D as closest aligns with the observed short distance between C and D on the tree.

Which species is closest to C based on the following phylogenetic tree?单项选择题

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