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Degree of relationship

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Degree of relationship

The degree of relationship helps define the proportion of genes shared by two blood relatives.

First degree relatives (parents, siblings, children) share 1/2 of their genes, second degree relatives (uncles, aunts, nephews, nieces, grandparents, grandchildren and half- siblings) share 1/4 of their genes and third degree relatives (first cousins, great-grandparents and great-grandchildren share 1/8 of their genes.

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