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Genetics

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READY FOR A CLOSE-UP  Dolly the Sheep’s bones were X-rayed to determine whether the sheep was plagued by arthritis linked to cloning.

brushtail possum

SO CUTE, SO WRONG  No one has a genetic way of getting rid of invasive brushtail possums (shown) in New Zealand, but now is the time to debate whether CRISPR gene drives are too strong to be considered, two researchers argue.

map of Yamnaya migrations

BIG MOVES  Ancient DNA indicates horse-riding pastoralists called the Yamnaya made two long-distance migrations around 5,000 years ago. One trip may have shaped Europe’s ancient Corded Ware culture, while the other launched central Asia’s Afanasievo culture.

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