(Q001) Watch the animation "Hominin Phylogenies" and answer the question that follows.
https://util.wwnorton.com/jwplayer?type=video&msrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_hominin_phylogenies.mp4&isrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_hominin_phylogenies.jpg&csrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_hominin_phylogenies.vtt&cp=1

Ardipithecus ramidus is located at the base of all four phylogenies in the animation. What does this position tell us about the relationships between Ardipithecus ramidus and the other species in the phylogenies?

Question

(Q001) Watch the animation "Hominin Phylogenies" and answer the question that follows.
https://util.wwnorton.com/jwplayer?type=video&msrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_hominin_phylogenies.mp4&isrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_hominin_phylogenies.jpg&csrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_hominin_phylogenies.vtt&cp=1

Ardipithecus ramidus is located at the base of all four phylogenies in the animation. What does this position tell us about the relationships between Ardipithecus ramidus and the other species in the phylogenies?

BlackTom AI · Accepted Answer

The question asks about the placement of Ardipithecus ramidus at the base of all four phylogenies shown in the animation, and what this implies about relationships to other species.
Option 1: 'Anthropologists generally agree that australopithecines and early Homo sapiens are all descendants of Ardipithecus ramidus.' This interpretation aligns with the idea that Ardipithecus ramidus sits near the common ancestor node for the later hominins pictured (australopithecines and early Homo). In phylogenetic trees, a base position for Ardipithecus ramidus suggests it is ancestral to those lineages, indicating descent from this species to later groups.
Option 2: 'Anthropologists generally agree that Ardipithecus ramidus is the descendant of Australopithecus afarensis.' If Ardipithecus ramidus were a descendant, we would expect Ardipithecus ramidus to appear lower (more derived) than Australopithecus afarensis in the tree, not at the base. This contradicts the stated base placement and thus misrepresents the inferred direction of ancestry.
Option 3: 'Anthropologists generally agree that Australopithecus afarensis has no direct descendant.' This claim is inaccurate in paleontology because Australopithecus afarensis is typically viewed as an early hominin that contributes to later lineages, not as a terminal taxon with no descendants. The idea of no direct descendants contradicts well-supported evolutionary relationships.
Option 4: 'Anthropologists generally agree that Ardipithecus ramidus is the oldest australopithecine.' Ardipithecus ramidus is not classified as an australopithecine; it predates the genus Australopithecus and is not considered an australopithecine itself. Calling it the oldest australopithecine confuses taxonomy and the standard phylogenetic placement described by the animation.

In summary, Option 1 best matches the implication of Ardipithecus ramidus occupying the base position across multiple phylogenies, indicating it as an ancestral reference point for the later australopithecines and early Homo sapiens. The remaining options conflict with the base placement and established evolutionary relationships depicted in the animation.

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