Several studies were conducted in 2010, 2011, and 2012 to trace back the origins for the sex chromosomes in the Philippine Negretio, and this resulted in Chromosomal DNA being found as local to the area and relatively untainted by nearby populations while Mitochondrial DNA suggests a strong common ancestor to those in Taiwan.[1] DNA gathered in between 1975 and 1985 was collected and tested by a separate group in which they found evidence of interbreeding with non-Negrito groups from the Austronesian area. The Batek are the only ones who seemed to have not had a different group emerge from this interbreeding.[2] Within the Negrito population there have been 11 haplogroups found in terms of Y-chromosome studies and the genetic variety is magnified by the smaller population sizes. And these groups all show little connection back to the Negrito themselves, primarily coming from groups within southeast Asia.[3] Using a study of mitochondrial DNA, it was found that there have been several migrations from Asia to Malaysia which has helped build the diversity in the populations on the island. These migrations seemed to have been slow and long based on simulations made by the researchers.[4]
- ^ Jinam, Timothy (2017). Discerning the Origins of the Negritos, First Sundaland People: Deep Divergence and Archaic Admixture. USA: Oxford University Press. pp. p2013-2022.
{{cite book}}:|pages=has extra text (help) - ^ Heyer, M. (2013). Genetic Diversity of Four Filipino Negrito Populations from Luzon: Comparison of Male and Female Effective Population Sizes and Differential Integration of Immigrants into Aeta and Agta Communities. USA: Wayne State University Press. pp. p189.
{{cite book}}:|pages=has extra text (help) - ^ The Y-chromosome landscape of the Philippines: extensive heterogeneity and varying genetic affinities of Negrito and non-Negrito groups.
- ^ Arenas, Miguel. The Early Peopling of the Philippines based on mtDNA.