Genetic Geography

It's far from perfect, but researchers unveil the first complete map of all 23 pairs of human chromosomes

The first maps of the New World, drawn back in the age of Columbus and Magellan, were pitifully primitive. The early European explorers and cartographers thought that America was just a narrow strip of land and that the Pacific Ocean was small enough for a galleon to cross in a couple of weeks. But despite all their shortcomings, those first stabs at mapmaking captured the imaginations of adventurers and spurred more voyages of discovery.

In much the same way, today's explorers of the genetic frontier have doggedly navigated the 23 pairs of human chromosomes in their search for various genes --...

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