Задание

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                                                              Scientists may have cracked da Vinci's DNA

Historians Alessandro Vezzosi and Agnese Sabato have spent more than a decade tracing the genealogy of Leonardo da Vinci. The researchers have 30.___________ a wonderful job. Their map stretches across 690 years, 21 generations and five family branches, and will prove vital in helping anthropologists sequence the DNA of da Vinci by sequencing the DNA of his descendants.

In their recent study, Vezzosi and Sabato traced the five branches of the da Vinci family tree. There are difficulties 31.___________ researching da Vinci's family history because only one of his parents can be properly traced. However, Vezzosi and Sabato didn't throw in the 32.___________, continued their work and eventually succeeded.

When da Vinci died on May 2, 1519 at age 67, he had no known children and his burial was lost, meaning there was no reliable DNA to analyse. As a result, parts of his ancestry have become shrouded in 33.___________. 34.___________ to records, Da Vinci's original burial was at the chapel of Saint-Florentin at the Chateau d'Amboise, a manor house in France's Loire Valley. The chapel was left to ruin after the French Revolution, and later demolished. Contemporaneous accounts allege that a full skeleton was exhumed from the site and moved to the nearby Saint-Hubert chapel, but whether or not they are actually da Vinci's bones remains a mystery.

The new family tree, 35.___________ starts in 1331 with family patriarch Michele, reveals 14 living relatives with a wide variety of occupations.

The researchers will determine whether the human 36.___________ from the Loire Valley chapel belong to da Vinci by comparing the Y chromosome in those bones to the Y chromosome belonging to da Vinci's male relatives. The Y chromosome is passed from father to son and remains virtually unchanged for as long as 25 generations.

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