Lineage (genetic)

[1] Incomplete lineage sorting describes when the phylogenetic tree for a gene does not match that of the species.

[3][4] Lineage selection is also useful in determining the effects of mutations in highly structured environments such as tumors.

Tree sequence recording has been incorporated into the population simulation software SLiM.

[10][11] Among eukaryotes, almost all lineages with asexual modes of reproduction maintain meiosis either in a modified form or as an alternative pathway.

[12] A constraint on a meiotic sexual lineage undergoing switching to an ameiotic, asexual form of reproduction appears to be the concomitant loss of the protective recombinational repair of DNA damage that is a key function of meiosis.

Figure 1. Incomplete lineage sorting. The gene G has two versions (alleles), G0 and G1. The ancestor of A, B and C originally had only one version of gene G, G0. At some point, a mutation occurred and the ancestral population became polymorphic, with some individuals having G0 and others G1. When species A split off, it retained only G1, while the ancestor of B and C remained polymorphic. When B and C diverged, B retained only G1 and C only G0; neither were now polymorphic in G. The tree for gene G shows A and B as sisters, whereas the species tree shows B and C as sisters.