Photo: Bronze Age Day Depiction/Hans Splinter/Flickr
Maybe that’s how it started. to pass (The genus Passer was coined by the French zoologist Mathurin Jacques…) in Britain (Britain is an island off the northwest…) 4500 years ago and through the ages Bronze (Bronze is a common name for alloys of copper and tin. The term brass…) who followed. Looking at the genes of different populations since that time, we see changes in seven regions genome (The genome is the entire individual or…) which cannot be attributed to the sole possibility (In common parlance, the word random is used to express a lack of efficiency, otherwise…): almost all of these genes can be associated with increased production vitamin D (Vitamin D is a fat-soluble (fat-soluble) vitamin synthesized by…) and from calcium (Calcium is a chemical element with symbol Ca and atomic number 20.). Which would correspond to the “selective pressure” which geography (Geography (from ancient Greek γεωγραφία…) weighting these populations, we read a research (Scientific research primarily refers to all the steps taken to…) published in advance March 16
The two authors, a geneticist and a statistician, agree that their analysis does not prove causation. However, their research is attracting attention because they fall into the meaning (SENS (Strategies for Engineered Negligible Senescence) is a research project aimed at…) of what for a long time led only to intuition: since migrating to Country (Country comes from the Latin pagus, which indicated a division of territorial and tribal scale…) from North (North is the cardinal point, opposite south.) from’Europe (Europe is a land region that can be considered…)them Homo sapiens faced with less sunny countries and shorter days, their skin (The skin is an organ made up of several layers of tissue. It performs, among other things…) darker had to be gradually replaced by paler skin, therefore absorbing more UV rays, therefore producing more vitamin (A vitamin is an essential organic substance (in doses from micrograms to…) D. The introduction of agriculture to this c pressure (Pressure is a basic physical concept. You can think of it as a reported force…) additional.
But this hunch seems to be confirmed by gene analysis: the work of these two researchers consisted of an analysis statistical (A statistic is, at first glance, a number calculated about a sample…) observed variants in 529 “British” genomes from different eras and 98 present-day genomes.
The difficulty with such an analysis is to prove that the variant took hold in the population because it brought about a “selective” advantage—natural selection—and not just by chance. But the crux of their conclusion is vitamin D: not only does our body produce more of it when exposed to UV light, but vitamin D also helps absorb calcium, which in turn strengthens bones. Two factors have given humans a “selective” advantage in having this variant, making them more likely to pass it on to their offspring.
Of course, people have lived in these regions for over 4,500 years. A study published in 2018 it is thus established that “IMan (A man is an adult male individual belonging to modern man (Homo…) Cheddar”, lived England (England is one of the four countries of the United Kingdom…) 10,000 years ago had dark skin.
However, these predecessors explain The new scientistwere hunter-gatherers who could obtain vitamin D fish (In the classical classification, fish are aquatic vertebrates…). With the introduction of animal husbandry and agriculture, populations became less mobile but included milk, a source of calcium, in their diet. This is what biologists call a “pressure” for evolution.
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