Phylogenetic structure of Guinea-Bissau ethnic groups for mitochondrial DNA and Y chromosome genetic systems

The maternal and paternal genetic profile of Guineans is markedly sub-Saharan West African, with the majority of lineages belonging to L0-L3 mtDNA sub-clusters and E3a-M2 and E1-M33 Y chromosome haplogroups. Despite the sociocultural differences among Guinea-Bissau ethnic groups,marked by the supposedly strict admixture barriers, their genetic pool remains largely common. Their extant variation coalesces at distinct timeframes, from the initial occupation of the area to later inputs of people. Signs of recent expansion in mtDNA haplogroups L2a-L2c and NRY E3a-M2 suggest population growth in the equatorial western fringe, possibly supported by an early local agricultural centre, and to which the Mandenka and the Balanta people may relate. Non-West African signatures are traceable in less frequent extant haplogroups, fitting well with the linguistic and historical evidence regarding particular ethnic groups: the Papel and Felupe-Djola people retain traces of their putative East African relatives; U6 and M1b among Guinea-Bissau Bak-speakers indicate partial diffusion to Sahel of North African lineages; U5b1b lineages in Fulbe and Papel represent a link to North African Berbers, emphasizing the great importance of post-glacial expansions; exact matches of R1b-P25 and E3b1-M78 with Europeans likely trace back to the times of the slave trade.

Portugal: manifest for the republic education or teacher education under scrutiny

Starting from the analysis of a Manifest placed in the World Wide Web in order to gather signatures, the paper discusses the arousal of a wide spread movement of scepticism in the so called Portuguese “civil socie ty” against the overall result of almost forty years of uninterrupted educational reform that has taken place in Portugal since the late sixties and has lead to an increasing percentage of illiteracy and innumeracy. That Manifest is presented as part of a broader movement, deeply rooted in the Portuguese society, and silent so far, which is becoming stronger and has now strength enough to be part of the political agenda. It is also our concern to unveil an emerging trend of blaming sciences of education and badly trained teachers as responsible for the poor outcome of our schooling system.