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Dr. Tang was itching to get to the bottom of B. germanica’s genealogical tree, so his team sourced DNA from 281 German cockroaches from 17 countries to study their genetic differences.

Investigators identified Birdlong using DNA evidence and a genealogical tree created by a Texas DNA research facility.

She greets us, rather forebodingly, with a genealogical tree, as if the extended Stoppard family were a medieval royal house.

In Ballard’s 1962 novel, set in a submerged London, “the birth of a child had become a comparative rarity, and only one marriage in 10 yielded any offspring … the genealogical tree of mankind was systematically pruning itself.”

But it was evident in Ty’s collaborations that all genres were of the same genealogical tree.