12 Biology by Natalie Thackwell https://padlet.com/nth/12bio EBI Question- Practice Response en-us 2016-10-30 22:03:42 UTC 2016-10-30 23:08:36 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Lightdecrease.png Natural selection relies on the survival of the fittest. Yet, modern medicine is interrupting this process and effectively stopping our species from evolving. Some argue that this leaves our species vulnerable to extinction at the next significant environmental event.  You are to provide justified arguments for both sides of the debate, and then conclude by deciding which group of scientists provide a more credible argument. Justify your conclusion. nth https://padlet.com/nth/12bio/wish/134110898

]]> 2016-10-30 22:06:34 UTC https://padlet.com/nth/12bio/wish/134110898 https://padlet.com/nth/12bio/wish/134114318 Natural Selection is a natural process that results in the survival and reproductive success of individuals or groups best adjusted to their environment and that leads to the perpetuation of genetic qualities best suited to that particular environment. In other words, a process by which plants and animals that can adapt to changes in their environment are able to survive and reproduce while those that cannot adapt so not survive. ]]> 2016-10-30 22:53:28 UTC https://padlet.com/nth/12bio/wish/134114318 https://padlet.com/nth/12bio/wish/134114346 Natural selection or another phrase for it, the survival of the fittest is when organisms have the most adaptive characteristics therefore allowing them to survive and pass on these useful characteristics generation to generation.  

]]> 2016-10-30 22:53:52 UTC https://padlet.com/nth/12bio/wish/134114346 https://padlet.com/nth/12bio/wish/134114376 There are new selection pressures for us to adapt to– technology, pollution, UV radiation, electromagnetic radiation from electrical devices ]]> 2016-10-30 22:54:18 UTC https://padlet.com/nth/12bio/wish/134114376 https://padlet.com/nth/12bio/wish/134114427 Over time evolution has been a big part in the development of the human species

]]> 2016-10-30 22:54:52 UTC https://padlet.com/nth/12bio/wish/134114427 https://padlet.com/nth/12bio/wish/134115108 Charles Darwin explores the idea of natural selection in particular survival of the fittest.   Many scientists are on debate about this issue some claiming that the evolution of humans has ended and others claiming that is slowly still occurring. ]]> 2016-10-30 23:03:14 UTC https://padlet.com/nth/12bio/wish/134115108 FOR NATURAL SELECTION: The findings suggest that about 9 percent of the human genes examined are undergoing rapid evolution. "Our study suggests that natural selection has played an important role in patterning the human genome," said Carlos Bustamante, a biologist at Cornell University. A separate study announced last month indicated the human brain is still evolving, too. Compared to chimps, Bustamante's team found that the genes most affected were those involved in immunity, sperm and egg production and sensory perception. A comparison between human and chimpanzee genomes found that these genes have undergone more changes in humans than in chimps, despite the fact that the two species shared a common ancestor some 5 million years ago. http://www.livescience.com/445-darwin-natural-selection-work-humans.html https://padlet.com/nth/12bio/wish/134115245 2016-10-30 23:04:50 UTC https://padlet.com/nth/12bio/wish/134115245 AGAINST NATURAL SELECTION: A species is an entity that has temporal (time) and spatial (geography) dimensions. So an expanding population/species covers more and more geography over time, and so on. I think what is usually meant by “humans” is humans in this modern world of medicine and dominance over the environment, etc. In particular, it means humans as a population not subject to scarcities of food, ravages of predation, and suffering by disease. This is because in many people’s minds evolution roughly equals natural selection and its effects, and natural selection roughly equals these listed aspects of the environment and their effects. The struggle for existence, the competition for food, and so on. And the struggle is over. The other biggie, sexual selection, is often left out of the discussion. The popular mindset often seems to lack a concept of human mate competition or mate choice as factors in human evolution or human affairs in general. I think this is due to modern conceptions of monogamy. We fool ourselves into thinking that since there is the same number of men and women. and everybody eventually gets married to a member of the opposite sex, etc. , then there really is no mating competition or sexual selection. (Not true, not true, and not true.) This is a deeply fascinating set of assertions, beliefs, fallacies, and innuendos. Almost everything in evolution is about food and sex. If we have removed with modern medicine, agriculture, and deadly weapons the parasites, predators, and food limitations from our environment, that does not mean that we are not evolving. What it means is that a large number of selective forces have shifted. Since we are talking mainly about stabilizing selection related to the ability to find food, avoid predators, etc. (maybe some directional selection as well), this mostly means that we are experiencing “relaxed selection.” http://webcache.googleusercontent.com/search?q=cache:GwJWCO_aqCsJ:scienceblogs.com/gregladen/2009/08/24/humans-are-no-longer-subject-t/+&cd=8&hl=en&ct=clnk&gl=au https://padlet.com/nth/12bio/wish/134115472 2016-10-30 23:08:36 UTC https://padlet.com/nth/12bio/wish/134115472