Dissecting the Genetic History of São Tomé e Príncipe: A New Window from Y-Chromosome Biallelic Markers

2006 ◽  
Vol 71 (1) ◽  
pp. 77-85 ◽  
Author(s):  
M.J. Trovoada ◽  
L. Tavares ◽  
L. Gusmão ◽  
C. Alves ◽  
A. Abade ◽  
...  
2018 ◽  
Vol 45 (1) ◽  
pp. 44-56 ◽  
Author(s):  
Viola Grugni ◽  
Alessandro Raveane ◽  
Francesca Mattioli ◽  
Vincenza Battaglia ◽  
Cinzia Sala ◽  
...  

2019 ◽  
Vol 295 (1) ◽  
pp. 221-231 ◽  
Author(s):  
Atif Adnan ◽  
Guanglin He ◽  
Allah Rakha ◽  
Kaidirina Kasimu ◽  
Jianxin Guo ◽  
...  

2017 ◽  
Author(s):  
David G. Mahal

The human male specific Y-chromosome passes from father to son essentially unchanged, but occasionally a random change, known as a mutation, occurs. These mutations, also called markers, serve as beacons and can be mapped. When geneticists identify a mutation in a DNA test, they try to determine when it first occurred and in which part of the world. Thus, the Y-chromosome haplogroup, which is a population group descended from a common ancestor, can be used to trace the paternal lines of men. The poster describes a research project that aims to identify the ancient geographical origins of key ethnic communities of the Indian subcontinent, based on their Y-DNA haplogroups.


2017 ◽  
Author(s):  
David G. Mahal

The human male specific Y-chromosome passes from father to son essentially unchanged, but occasionally a random change, known as a mutation, occurs. These mutations, also called markers, serve as beacons and can be mapped. When geneticists identify a mutation in a DNA test, they try to determine when it first occurred and in which part of the world. Thus, the Y-chromosome haplogroup, which is a population group descended from a common ancestor, can be used to trace the paternal lines of men. The poster describes a research project that aims to identify the ancient geographical origins of key ethnic communities of the Indian subcontinent, based on their Y-DNA haplogroups.


Author(s):  
Stefania Sarno ◽  
Rajiv Boscolo Agostini ◽  
Sara De Fanti ◽  
Gianmarco Ferri ◽  
Silvia Ghirotto ◽  
...  

Itinerario ◽  
2014 ◽  
Vol 38 (1) ◽  
pp. 103-124 ◽  
Author(s):  
Alexander Keese

The crossroads of nationalist historiographies in sub-Saharan Africa and of the history of developmentalist attempts that characterise the European late colonial states, have left us with very incomplete images of important trajectories. In the seemingly more “liberal” large colonial empires—notably the French and British—sails were set by 1945 towards a policy of investment and economic change. Some of the scholarly debates question whether this investment was genuine or just a last resort to avoid (rapid) decolonisation; others put the emphasis on inadequate routines of development implemented in these territories, many of which have apparently been continued since decolonisation.In this context, we encounter a clear lack of understanding about how decisions made by individual actors on the administrative level interacted with the larger panorama of social conditions in colonial territories, and of the consequences that these interactions had for the paths towards decolonisation. For a smaller empire such as the Belgian colony of Congo-Léopoldville, these processes are still more obscure; and for the colonies ruled by authoritarian metropoles, as in the cases of territories under Spanish and Portuguese rule, stagnation and absence of change are often taken for granted. In other words, these territories, which were under the rule of metropoles regarded as rather weak in economic terms, are treated as unrepresentative of the broader, European movement towards change in colonial policies. However, the conditions of change towards economic and social modernisation in this latter group of empires, even when inhibited by lack of funding and weak professionalisation of the administration, are frequently very telling for the broader range of challenges that the late colonial states faced.


1986 ◽  
Vol 16 (5) ◽  
pp. 1013-1018 ◽  
Author(s):  
Lauren Fins ◽  
Lisa W. Seeb

Seed samples from 19 stands of Larixoccidentalis Nutt. were analyzed for electrophoretic variation at 23 loci. Because sample sizes consisted of only 9 or 10 trees per stand (18–20 alleles per locus per stand), samples were grouped by geographic proximity into four larger samples. For all measures of variation, this species scored lower than most, but within the range observed for other western conifers. Most of the variation was found within rather than between the population groups. The single southern sample appeared to be genetically distinct from the others. Although some variation was observed between individual stand samples in expected heterozygosity, the consistently low values for all samples suggest that genetic drift has played a major role in the genetic history of the species in the Inland Empire, both through its glacial history in postulated refugia and through fire history in recent times.


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