Degree of relationship
Encyclopedia
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. First degree relatives include parents, offspring, and siblings. An uncle/aunt, niece/nephew or a grandparent is a second-degree relative, and a first cousin is a third-degree relative. 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.
.
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.
Kinship
Kinship is a relationship between any entities that share a genealogical origin, through either biological, cultural, or historical descent. And descent groups, lineages, etc. are treated in their own subsections....
, and may generally be measured as either one vertical or horizontal step in a standard family tree
Family tree
A family tree, or pedigree chart, is a chart representing family relationships in a conventional tree structure. The more detailed family trees used in medicine, genealogy, and social work are known as genograms.-Family tree representations:...
.
A first-degree relative is a family member who shares about 50 percent of their genes with a particular individual in a family. First degree relatives include parents, offspring, and siblings. An uncle/aunt, niece/nephew or a grandparent is a second-degree relative, and a first cousin is a third-degree relative. 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 incestIncest
Incest is sexual intercourse between close relatives that is usually illegal in the jurisdiction where it takes place and/or is conventionally considered a taboo. The term may apply to sexual activities between: individuals of close "blood relationship"; members of the same household; step...
.
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
Genealogy
Genealogy is the study of families and the tracing of their lineages and history. Genealogists use oral traditions, historical records, genetic analysis, and other records to obtain information about a family and to demonstrate kinship and pedigrees of its members...
(especially genetic genealogy
Genetic genealogy
Genetic genealogy is the application of genetics to traditional genealogy. Genetic genealogy involves the use of genealogical DNA testing to determine the level of genetic relationship between individuals.-History:...
) to measure the level of genetic relationship between individuals.