Degree of relationship

Degree of relationship

Degree of relationship is a measurement of kinship, and may generally be measured as either one vertical or horizontal step in a standard family tree.

A first-degree relative is a family member who shares about 50 percent of their genes with a particular individual in a family.[1] First degree relatives include parents, offspring, and siblings.[1] An uncle/aunt, niece/nephew or a grandparent is a second-degree relative, and a first cousin is a third-degree relative.[2] Degrees of relation should not be confused with degrees when referring specifically to kinship with cousins. For example, a first-degree cousin is actually a third-degree relative.

Uses

It is an important measurement in law to determine where marriage is allowed or prohibited under the laws concerning incest.[3]

It is also an important measure in medicine when determining risk factors for various diseases with a strong hereditary association.

It is also used in genealogy (especially genetic genealogy) to measure the level of genetic relationship between individuals.

See also

Genetic genealogy

References

  1. ^ a b Genetics Home Reference > First-degree relative Lister Hill National Center for Biomedical Communications. Published: March 29, 2010
  2. ^ FORCE: Facing Our Risk of Cancer Empowered > Hereditary cancer and cancer genetics Retrieved on April 4, 2010
  3. ^ Law Encyclopedia: Consanguinity Retrieved on April 4, 2010

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