In the last three years, the number of human genomes that have been sequenced (their DNA read letter by letter) has jumped from a handful to hundreds, with thousands more in progress. But all of those genome readings lack some crucial information. A person inherits two copies of each chromosome, one maternally and one paternally. Existing sequencing methods do not indicate whether genetic variations that lie close to each other on the genomic map were inherited from the same parent. (source: technologyreview.com)
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