Dynamics of Adaptive Introgression from Archaic to Modern Humans
... relatively high frequencies. Both observations may be surprising under the hypothesis that modern humans originated first in Africa and displaced archaic populations through expansion and drift. Here, we outline how natural selection may have enabled the uptake of introgressive alleles from archaic ...
... relatively high frequencies. Both observations may be surprising under the hypothesis that modern humans originated first in Africa and displaced archaic populations through expansion and drift. Here, we outline how natural selection may have enabled the uptake of introgressive alleles from archaic ...
new version of the theory of unique and recent origin of modern man
... differentiate the two principal species, erectus and sapiens, of our genus. Hence they tried to define H. sapiens as having modern DCT in contrast with H. erectus having primitive DCT. But the variation of DCT during the long existence period of Homo peoples shows a complex continuation and it is in ...
... differentiate the two principal species, erectus and sapiens, of our genus. Hence they tried to define H. sapiens as having modern DCT in contrast with H. erectus having primitive DCT. But the variation of DCT during the long existence period of Homo peoples shows a complex continuation and it is in ...
The evolution of the anatomically modern or
... multiregional continuity theory, and also allow for some ...
... multiregional continuity theory, and also allow for some ...
Evolution of the human pygmy phenotype
... As one of three endocrine systems regulating somatic growth and stature, the GH1-IGF1 pathway has been an attractive candidate for understanding the underlying physiological mechanisms of the pygmy phenotype. Perturbations of this pathway have been reported in rainforest hunter-gatherer populations ...
... As one of three endocrine systems regulating somatic growth and stature, the GH1-IGF1 pathway has been an attractive candidate for understanding the underlying physiological mechanisms of the pygmy phenotype. Perturbations of this pathway have been reported in rainforest hunter-gatherer populations ...
Deviations from Mendelian Genetics-Organelles
... Certain human genetic diseases are caused by mutations in mtDNA. Certain muscle and neurological diseases are caused by mutations in mtDNA; however, any mutation that severely disrupts mitochondrial function will not be tolerated unless wild-type mtDNA is also present. Human cells often contain app ...
... Certain human genetic diseases are caused by mutations in mtDNA. Certain muscle and neurological diseases are caused by mutations in mtDNA; however, any mutation that severely disrupts mitochondrial function will not be tolerated unless wild-type mtDNA is also present. Human cells often contain app ...
A Case Study and Meta-Analysis of Type 2 Diabetes Research
... analysis concerning the varying genetic susceptibility of different “ethnic groups”. Firstly, who are these ethnic groups? Native American Indians throughout the Americas have tended to lose their genetic isolation and recognizability post-colonization. Therefore, any claim reliant on these sweeping ...
... analysis concerning the varying genetic susceptibility of different “ethnic groups”. Firstly, who are these ethnic groups? Native American Indians throughout the Americas have tended to lose their genetic isolation and recognizability post-colonization. Therefore, any claim reliant on these sweeping ...
Your Hominid Ancestry (60000 years ago and older)
... ancestors made love, not war, with their European cousins, and the Neanderthal lineage disappeared because it was absorbed into the much larger human population. Even though Neanderthals and Denisovans are both extinct, modern humanity may owe them a debt of gratitude. A 2011 study by Stanford Unive ...
... ancestors made love, not war, with their European cousins, and the Neanderthal lineage disappeared because it was absorbed into the much larger human population. Even though Neanderthals and Denisovans are both extinct, modern humanity may owe them a debt of gratitude. A 2011 study by Stanford Unive ...
90717 Evolution answers-08
... differences sufficient that the two populations can no longer interbreed. As there is reproductive isolation between the populations ...
... differences sufficient that the two populations can no longer interbreed. As there is reproductive isolation between the populations ...
Chapter 15 Recent Human Evolution Overview • The first part of this
... This problem has not gone away. o A modern example of the effects of deforestation in the Amazon is reported here. o Much of the deforestation is to provide cheap food in the US. o Rain puddles are another source of disease; in fact, some suggest new forms of drug-resistant malaria reside in the pud ...
... This problem has not gone away. o A modern example of the effects of deforestation in the Amazon is reported here. o Much of the deforestation is to provide cheap food in the US. o Rain puddles are another source of disease; in fact, some suggest new forms of drug-resistant malaria reside in the pud ...
Population evolution
... major environmental changes cause evolution to occur rapidly followed by periods in which successful species change little ...
... major environmental changes cause evolution to occur rapidly followed by periods in which successful species change little ...
File
... Definition: Gene flow is the movement of alleles between populations. • How it works: Gene flow occurs when individuals join new populations and reproduce. • Lots of Gene flow results in neighboring populations that are similar. • Limited gene flow results in the chance that two populations will evo ...
... Definition: Gene flow is the movement of alleles between populations. • How it works: Gene flow occurs when individuals join new populations and reproduce. • Lots of Gene flow results in neighboring populations that are similar. • Limited gene flow results in the chance that two populations will evo ...
chapter 11.3 ppt note sheet
... SECTION 11.3: NATURAL SELECTION IS NOT THE ONLY MECHANISM BY WHICH POPULATIONS EVOLVE PPT NOTES 3 1. Is natural selection the only mechanism through which populations evolve? ...
... SECTION 11.3: NATURAL SELECTION IS NOT THE ONLY MECHANISM BY WHICH POPULATIONS EVOLVE PPT NOTES 3 1. Is natural selection the only mechanism through which populations evolve? ...
Genetic history of North Africa
The genetic history of North Africa has been heavily influenced by geography. The Sahara desert to the south and the Mediterranean Sea to the North were important barriers to gene flow in prehistoric times. However, Northeast Africa and the Levant form a single land mass at the Suez. At the Straits of Gibraltar, North Africa and Europe are separated by only 15 km (9 mi). At periods of low sea-levels, such as during a glacial maximum, islands that are currently submerged would appear in the Mediterranean and possibly in between the Gibraltar straits.These may have encouraged humans to ""island hop"" between Africa and Europe. During wetter phases of the Sahara, some Saharan inhabitants would have expanded north into southern parts of North Africa. West Asian populations would have also been attracted to a wet Sahara. West Asian populations could also migrate into Africa via the coastal regions of the Mediterranean.As a result of these geographic influences, the genetic profile of North African populations is a complex mosaic of European, West Asian and Sub-Saharan African influences to variable degrees. Though North Africa has experienced gene-flow from the surrounding regions, it has also experienced long periods of genetic isolation in some parts, allowing a distinctive genetic markers to evolve in some Maghrebi populations, especially in some isolated Berber speaking people.Current scientific debate is concerned with determining the relative contributions of different periods of gene flow to the current gene pool of North Africans. Anatomically modern humans are known to have been present in North Africa during the Upper Paleolithic, 45,000 years ago, as attested by the Aterian culture. With no apparent continuity, 22,000 years ago, the Aterian was succeeded by the Iberomaurusian culture which shared similarities with Iberian cultures. The Iberomaurusian was succeeded by the Capsian, a pre-Neolithic culture. Around 9,000 years ago, the Sahara desert entered a wet phase, the Neolithic Subpluvial, which attracted Neolithic peoples from elsewhere in Africa and the Near East.In historic times, North Africa was occupied by various populations including, the Phoenicians (814–146 BCE), Romans (146 BCE–439 CE), Vandals and Alains (439–534 CE), and Byzantines (534–647 CE). In the 7th century, Islam was diffused in the area. Under the unifying framework of Islam, on the one hand, and the settlement of some Middle Eastern tribes together with the migration of the Moors of Andalusia into the Maghreb (after the Spanish Catholic Reconquista) on the other, a fusion took place that resulted in a new ethnocultural entity all over the Maghreb and Egypt and all contributed to the diffusion of the Arab-Islamic culture among the North African populations.