HOME of multicellularity

According to the most recent study of Kirk in 2003, there have been tracks where possibly come multicellularity. To learn about the origin of multicellularity, previously had to speculate, as occurred in obscure circumstances, we can only imagine how the body would suddenly went from unicellular to multicellular. And here is where the family known Volvocaceae, home Chlamydomonas and Volvox with over 9 genera and 40 species, we have opened the panorama of study. They give us an idea of how it went from being single-celled Chlamydomonas, a multicellular Volvox. Molecular phylogenetic analysis of genes in the nucleus and chloroplasts (Coleman, 1999, Nozaki et al., 1999.2000) indicates that the family Volvocaceae constitutes a coherent monophyletic group, single-celled ancestor who is closely related to modern Chlamydomonas reinhardii (Coleman and Mai, 1997). In fact this study shows that C. reinhardii is more closely related than the other volvocaceanos Chlamydomonas (Bucheim and Chapman 1991, Buchheim et al. 1994, 1996, Larson et al., 1992, Coleman and Mai, 1997 Pr schols et al., 2001). In fact, have estimated that C. reinhardii is more related to Volvox carteri. All this indicates that algae are more volvocines genomic evidence of coming from the unicellular to the multicellular today that members with the highest number of multicellularity. Several studies have concluded that the genus is polyphyletic olvox V (Larson et al., 1992, Nozaki et al., 1995, 1999, 2000, Coleman 1999). In fact, a recent study shows that 11 species of Volvox are in five different lineages. But this is not something that was not anticipated, since the same differences between species and indicated a polyphyletic group. However, Volvox is not the only taxon polyphyletic.For example, phylogenetic reconstruction is based on the long sequence of subunits of rubisco (rbcL) shows that Eudorina, Pleodorina and Volvox are closely related, but at the same time reveals the degree of relationship in the family section Volvocaceae. It also shows that gender Eudorina is polyphyletic, and this type of species, E. elegans is paraphyletic. Volvocacean family, given that it is a polyphyletic taxon, cladograms have been created that are more like "bush" because such a variety of sources.