Doctor Who (2013 specials) of the Doctor" and "The Time of the Doctor", as composed by Murray Gold, were released on 24 November 2014 by Silva Screen Records. Doctor Who (2013 specials) The 2013 specials of the British science fiction television programme "Doctor Who" are two additional episodes following the programme's seventh series. In addition to the traditional Christmas episode, which has been a feature of the revived series since 2005, there was also a special celebrating the 50th anniversary of the programme. Both episodes starred Matt Smith as the Eleventh Doctor and Jenna Coleman as Clara Oswald. The 50th anniversary special, "The Day
Most recent common ancestor all of the modern population. Due to pedigree collapse, modern individuals may still exhibit clustering, due to vastly different contributions from each of ancestral population . Most recent common ancestor In biology and genealogy, the most recent common ancestor (MRCA, also last common ancestor (LCA), or concestor) of any set of organisms is the most recent individual from which all the organisms are directly descended. The term is also used in reference to the ancestry of groups of genes (haplotypes) rather than organisms. The MRCA of a set of individuals can sometimes be determined by referring to an established pedigree.