The widespread presence of the sweet potato (*Ipomoea batatas*), a crop native to the Americas, throughout Polynesia prior to European contact has long presented an anthropological puzzle. For decades, the dominant hypothesis, championed by Thor Heyerdahl, posited that prehistoric South American mariners drifted westward, introducing the tuber to the Pacific islands. However, modern linguistic and genetic analyses suggest a different, albeit equally complex, narrative. While the Polynesian word for sweet potato, *kumara*, bears a striking resemblance to the Quechua word *cumal*, radiocarbon dating of sweet potato remains in the Cook Islands predates the earliest evidence of large-scale Andean maritime navigation by several centuries.
Furthermore, recent genomic sequencing of both ancient and modern sweet potato lineages reveals that the Polynesian cultivars form a distinct genetic clade that diverged from South American ancestors roughly 100,000 years ago—long before human settlement of the Americas. Botanists argue that the sweet potato’s seeds, encapsulated in a hard, impermeable coat, are highly adapted for oceanic dispersal via ocean currents or migratory birds. Yet, this purely botanical explanation fails to account for the linguistic confluence.
To reconcile these findings, some anthropologists propose a bidirectional model. They infer that while the plant itself may have arrived in Polynesia via natural mechanisms millennia ago, subsequent, limited contact between Polynesian navigators—who were indisputably capable of traversing the vast expanse to the South American coast—and indigenous Andean populations likely occurred. During these localized encounters, the Polynesians may have adopted the Andean nomenclature for the plant they already possessed, while perhaps exchanging other cultural artifacts or techniques. This synthesis effectively decouples the biological dispersion of the sweet potato from the linguistic transmission of its name, satisfying both the genetic timeline and the linguistic evidence.
The final paragraph of the passage mentions a "genetic timeline" regarding the sweet potato. Based on the information provided in the passage, this timeline establishes which one of the following?
- The evolutionary branching of Polynesian sweet potato varieties from South American lineages occurred prior to the existence of human populations in the Americas.Cevap
- BThe distinct genetic clade of Polynesian sweet potatoes was encapsulated and preserved by early South American mariners during their westward navigations.
- CNatural oceanic dispersion is the only plausible explanation for the presence of any South American flora in the Pacific islands prior to European contact.
- DIndigenous Andean populations frequently embarked on localized maritime expeditions to Polynesia to exchange cultural artifacts and agricultural nomenclature.
- EGenomic sequencing of ancient plant lineages provides a more historically accurate chronology of human migration patterns than comparative linguistic analysis.