Lineage (obsolete: bloodline ) term used in biology, the direct number, are related by blood to the ancestors and their descendants together; it is between the female and male lineage differentiated ( maternal, paternal ). The lines can be viewed in ascending order: the ancestry ( ancestry ) - or in the descending line: the offspring ( descendants ).
The family history (genealogy ) uses the term sometimes in the sense of lineage ( male line ), the ethnosociology sometimes in conjunction with descent rules (see also Cultural differences on biological ancestry ).
In genetics, the female lineage through the DNA of the mitochondria are detected, the male line of descent through the Y - chromosome. In both cases, there are sections of DNA that are inherited without change from generation to generation in females from mother to daughter, from father to male sons.
By analyzing lineages archaeological genetics ( Archäogenetik ) can reconstruct the genetic evolution of a biological species; on people -related models include the Eve of the mitochondria, the Adam of the Y chromosome, or Aaron the Y chromosome (see also The Seven Daughters of Eve ).
The female and the male line of descent are medically in terms of inherited disorders of equal importance, for example in genetic counseling. Therefore, the modern family research strives for comprehensive, encompassing all lineages ancestral lists - instead of lineages that are focused only on the male side of the pedigree.