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Why are some of the pedigree nodes highlighted in red?

April 26, 2017highlighted nodes pedigree red

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Why are some of the pedigree nodes highlighted in red?

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The nodes highlighted in red have a marker with an allele/s that is inconsistent with Mendelian inheritance. In the image below, for example, child one is highlighted red, because she possesses allele 108 in marker Blue 3 when neither of her parents have this allele.