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Verbal·Information and Ideas·Command of Evidence
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Average Proportion of Genetic Ancestry during the Pre-Roman Iron Age in Britain
RegionEEF (%)WHG (%)Yamnaya (%)
Southern Britain45.58.546.0
Central Britain39.010.051.0
Wales37.59.553.0
Northern Britain36.012.052.0
Research has shown that in 3000 BCE, people in what is now Great Britain derived an average of 80 percent of their genetic ancestry from early European farmers (EEF) and the remaining 20 percent from western European hunter-gatherers (WHG). When the genetic influence of another group, the Yamnaya, rose substantially in Britain around 2450 BCE, the average proportion of ancestry from EEF in present-day England and Wales decreased, dropping to only 31 percent by 2100 BCE. Studying genetic data from the pre-Roman Iron Age (750–43 BCE) across regions of Britain, a researcher claims that a wave of people with relatively high proportions of EEF ancestry likely migrated into southern Britain between 2100 BCE and the pre-Roman Iron Age.
Which choice best describes data from the table that support the researcher’s conclusion?
A
The average proportion of WHG ancestry in the given regions remained below 15 percent throughout the pre-Roman Iron Age.
B
There was relatively little variation in the average proportions of Yamnaya ancestry across the given regions during the pre-Roman Iron Age.
C
During the pre-Roman Iron Age, people in the given regions typically had a lower average proportion of ancestry from EEF than from the Yamnaya.
D
The lowest average proportion of EEF ancestry during the pre-Roman Iron Age for the given regions was 36.0.