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Phased

From SNPedia

Phased data is able to distinguish strands of DNA. Full genome sequencing technologies can usually capture this, however a microarray typically cannot. It is (mostly) possible to infer phase, if microarray data from the mother and father is also available.

http://www.chromosomechronicles.com/2009/09/30/use-family-snp-data-to-phase-your-own-genome/

Question: what are phased and unphased genotypes?