Natural Selection News, Articles | The Scientist Magazine®

 

natural selection articles

Jul 23,  · For now, natural selection for efficient plant-eating is the main suspect for this whole suite of changes, but the case is not yet closed. Other examples. I don’t have space to go into other examples in detail, but to give a sense of what else is out there, here’s a partial list. Apr 30,  · In a world where we've tamed our environment and largely protected ourselves from the vagaries of nature, we may think we're immune to the forces of natural selection. But a . natural selection. Neanderthal Ancestry in Europeans Unchanged for Last 45, Years. Diana Kwon | Jan 23, The findings of a new study contradict previous results from some of the same scientists that suggested Neanderthal DNA was gradually removed from modern human genomes.


Evolution - News and Scientific Articles on Live Science


In a world where we've tamed our environment and largely protected ourselves from the vagaries of nature, we may think we're immune to the forces of natural selection. But a new study finds that the process that drives evolution was still shaping us as recently as the 19th century.

The finding comes from an analysis of the birth, natural selection articles, death, and marital records of people born between and in four farming or fishing villages in Finland. Researchers led by evolutionary biologist Natural selection articles Courtiol of the Institute for Advanced Study Berlin picked this time period because agriculture was well established by then and there were strict rules natural selection articles divorce and extramarital affairs.

The team looked at four aspects of life that affect survival and reproduction, key signposts of natural selection: Who lived beyond age 15, who got married and who didn't, how many marriages each person had second marriages were possible only if a spouse diedand how many children were born in each marriage. Natural selection was alive and well in all of the villages the researchers surveyed. Almost half of the people natural selection articles before age 15, for example, suggesting that they had traits disfavored by natural selection, such as susceptibility to disease.

As a result, they contributed none of their genes to the next generation. The numbers were about the same for landed and landless individuals, indicating that wealth did not buffer the environment enough to prevent natural selection from culling or favoring individuals. The Finns were also subject to sexual selection, in that men who were able to attract new mates had more offspring. With one partner, the average was about five children; with four partners, that jumped to 7.

Men benefited more than women in terms of begetting more children, most likely because they tended to remarry young women with good child-bearing potential. Thus sexual selection was more important in men than in women. From the records they had, the researchers could not tell which traits were being selected for, but the variation in the number of offspring—from zero to 17—indicates there was a large opportunity for selection to occur.

That variation is the grist for evolution. The importance of sexual selection is well accepted in birds and fish, "but this is the first time that sexual selection has been so well documented in humans," says Stephen Stearns, an evolutionary biologist at Yale University.

As for showing natural selection, "they are providing additional, confirmational evidence, natural selection articles. He thinks this work will inspire other researchers with large databases of data on humans to look at how selection operates in populations. Courtiol is not certain how strong natural selection is today, particularly in the developed world. But he says that at the very least, natural selection articles, the data show that even as recently as years ago, natural selection articles, it still played a role in shaping natural selection articles as a species.

As such, he notes, biological and cultural processes should both be considered in understanding how humans are changing through time. By Jennifer Couzin-Frankel Sep. By Giorgia Guglielmi Sep. By Tania Rabesandratana Sep. By Jeffrey Mervis Sep. By Meredith Wadman Sep. All rights Reserved. Got a tip? How to contact the news team. Science Insider. Possible second visitor from another star sighted By Daniel Clery Sep. Is the Loch Ness monster just a big eel? By Eva Frederick Sep, natural selection articles.

Cell Biology War of nerves Physics Quantum Darwinism seen in diamond traps Astronomy India spots fallen moon craft, fails to make radio contact Scientific Community Chinese ties don't faze European funders Scientific Community Open-access megajournals lose momentum Astronomy Robot detector to map cosmos for clues to dark energy's force.

 

Natural selection – News, Research and Analysis – The Conversation – page 1

 

natural selection articles

 

natural selection, evolution; natural selection, evolution. Image of the Day: Gene-Edited Reptiles. Nicoletta Lanese | Sep 4, Scientists injected unfertilized anole lizard eggs with CRISPR-Cas9 to produce albino offspring. Exploding Stars Probably Didn’t Spur Hominins to Walk Upright. Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin's grand idea of evolution by natural selection is relatively simple but often misunderstood. To find out how it works, imagine a population of beetles: There is variation in. Find the latest news and articles on evolution, one of the most substantiated concepts in science and the unifying theory of biological science.