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Missing Y Chromosomes Found to Be the Missing Link Between Neanderthals and Modern Humans

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 rbear    240

Humans have often been told that they carry the DNA of the Neanderthals; this suggests that at some point they have interbred. However, that is no longer the case today, as a new study suggests that today's humans have less or don't have the Neanderthal Y-chromosomes. Scientists would want to find out why. 

Experts have found that the Y chromosome could have been the major factor in setting the two lineages apart by creating conditions that might often lead to miscarriages if or when the two got together. Recent findings show that Neanderthals who lived in Europe and Asia may have already died out about 40,000 years ago.

According to modernreaders.com, there is about 2 percent of all non-African genomes in modern humans that are associated to Neanderthals, which implies that interbreeding attempts worked out alright. But this study still suspect that male offspring had more challenges to deal with compared to female offspring because they are the first one to undergo the in-depth research. cont scienceworldreport

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 Lucy Barnable    5,393

I'm very interested in this topic but there's so much misinformation given it's kind of difficult to sift out the lies.
Plus the illustrations they use are ridiculous. Neanderthals were not small brained, knuckle dragging idiots as pictured.

Human-Neanderthal relationships may be at root of modern allergies

Passionate encounters between ancient humans and their burly cousins, theNeanderthals, may have left modern people more prone to sneezes, itches and other allergies, researchers say.

The curious legacy comes from three genes that crossed into modern humans after their distant ancestors had sex with Neanderthals, or their close relatives the Denisovans, more than 40,000 years ago.

The prehistoric couplings left all non-Africans today carrying 1-6% of Neanderthal DNA. People whose ancestors never left the continent would not have crossed paths with Neanderthals or the Denisovans, a mysterious group of humans who lived in and around Siberia at the same time.

The three genes are among the most common strands of Neanderthal and Denisovan-like DNA found in modern humans, suggesting they conferred an evolutionary advantage. They probably boosted the immune system, since the genes are involved in the body’s first line of defence against pathogens such as bacteria and fungi.

But people who carry the three genes seem to pay a price in the form of an overly-sensitive immune system. One study by the US genetics company 23andme found that carriers of the genes were more likely to have asthma, hay fever and other allergies.
“A small group of modern humans leaving Africa would not carry much genetic variation,” said Janet Kelso, who led the research at the Max Planck Institute for evolutionary Anthropology in Leipzig. “You can adapt through mutations, but if you interbreed with the local population who are already there, you can get some of these adaptations for free.


The article above suggests Africans don't have allergies and that's not true.

Allergic Disorders in Africa and Africans: Is It Primarily a Priority?

Prevalence of Allergy and Allergens

The global prevalence of allergy is reported to be in the range of 20–30% of the world's population including different forms of allergic diseases.19 This global prevalence seems to have increased with time particularly in the last 3 decades.20 The symptoms of asthma, allergic rhinitis, and atopic eczema in adolescents, for example, have been increasing over years in Africa.21 Severe allergic reactions with systemic effects involving the whole body (anaphylaxis) may occur depending on etiology such as food allergy.22Mathematically, the prevalence of allergy is higher than even commonly reported diseases like tuberculosis (TB) and HIV/AIDS (Table 1). The consequences of allergic disorders particularly in southern Africa are so great that they can result into significant morbidity, employment absenteeism, loss of quality of life and in some instances, fatal outcomes. In addition, allergies remain to pose a huge health costs in affected regions, affecting all ages, from the poorest to the richest.23 Similar effects could be expected elsewhere across Africa necessitating dedicated efforts by scientists to study the disease and propose viable control strategies.









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