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Craft and Structure / Cross-Text Connections Difficulty: Hard

Text 1

In 2007, a team led by Alice Storey analyzed a chicken bone found in El Arenal, Chile, dating it to 1321–1407 CE—over a century before Europeans invaded the region, bringing their own chickens. Storey also found that the El Arenal chicken shared a unique genetic mutation with the ancient chicken breeds of the Polynesian Islands in the Pacific. Thus, Polynesian peoples, not later Europeans, probably first introduced chickens to South America.

Text 2

An Australian research team weakened the case for a Polynesian origin for the El Arenal chicken by confirming that the mutation identified by Storey has occurred in breeds from around the world. More recently, though, a team led by Agusto Luzuriaga-Neira found that South American chicken breeds and Polynesian breeds share other genetic markers that European breeds lack. Thus, the preponderance of evidence now favors a Polynesian origin.

Based on the texts, how would the author of Text 2 most likely respond to the underlined claim in Text 1?

By broadly agreeing with the claim but objecting that the timeline it presupposes conflicts with the findings of the genetic analysis conducted by Storey’s team

By faulting the claim for implying that domestic animals couldn’t have been transferred from South America to the Polynesian Islands as well

By critiquing the claim for being based on an assumption that before the European invasion of South America, the chickens of Europe were genetically uniform

By noting that while the claim is persuasive, the findings of Luzuriaga-Neira’s team provide stronger evidence for it than the findings of the genetic analysis conducted by Storey do

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Explanation

Choice D is the best answer because it accurately describes how the author of Text 2 would most likely respond to the underlined claim in Text 1. Text 1 indicates that Storey found a genetic mutation in South American chickens from before the European invasion and in Polynesian chickens, which implies that chickens were first brought to South America by Polynesian people. Text 2 explains that the genetic mutation Storey found is in chickens from all over the world, thus undercutting the mutation as evidence of a Polynesian origin. However, Text 2 goes on to say “[m]ore recently” Luzuriaga-Neira and colleagues found multiple genetic markers shared by South American and Polynesian chickens but “that European breeds lack,” which strongly suggests a Polynesian origin for the South American chickens. This indicates that the author of Text 2 believes Luzuriaga-Neira’s evidence for a Polynesian origin is compelling while Storey’s evidence has been undermined. Thus, the author of Text 2 would most likely agree with the underlined statement and believes Luzuriaga-Neira and colleagues’ evidence for the statement is stronger than Storey’s evidence is.

Choice A is incorrect because both texts indicate that chickens were introduced to South America before the arrival of Europeans. Text 1 states that the El Arenal chicken bone dates from “1321–1407 CE—over a century before Europeans invaded the region” and concludes that these chickens were likely brought to South America by Polynesians. While Text 2 is not as explicit about the time period as Text 1 is, nothing in Text 2 undermines the timing of events ascribed to Storey’s account in Text 1. Choice B is incorrect because both texts agree that chickens were first brought to South America by Polynesian peoples (the underlined claim), and nothing in Text 2 suggests that this claim is in any way deficient because the possibility that animals could have been transferred from South America to Polynesia was not explicitly addressed. Choice C is incorrect because the criticism that Text 2 raises about the ideas in Text 1 is specifically about whether the single genetic mutation cited by Storey in fact supports the idea of a Polynesian origin for South American chickens. There is nothing in Text 2 to suggest that the underlined sentence (Storey’s conclusion) is deficient because it is based on an assumption about the genetic uniformity of European chickens.