My theory (or idea) is that right now, the human evolution is going in two separate directions:
Direction 1: Evolution in the Rich Parts of the World
In the rich parts of the world, humans have plenty of access to food, medical treatment, and education. And there is a lot of genetic exchange between populations that were isolated from each other in the past.
As Dr. Hawks points out in his lectures for this course (Hawks, 2014), evolution started to accelerate for about 15.000 years ago. This was mainly due to the development of agriculture (Wikipedia, 2014) and different kinds of societies, that enabled a growing number of sedentary humans to coexist. And that led to the spreading of new useful genetic traits very rapidly. But today, (in the rich parts of the world) with our advanced medical treatments and technology, we are about to significantly lower the evolutionary selection pressure in several key areas: The immune system, the need to have a healthy body with regards to diabetes and heart diseases and the ability to reproduce.
The Immune System
The absence of many pathogens in the modern world due to the clean environment we live in, gives the human immune system a challenge it has never encountered before (Umetsu, 2002). But because the diseases which is caused by our clean environment can be treated to a point where we can live with it, the selection pressure is very low. And that gives the specific genetic traits the chance to be inheritable. And asthma is just one example.
A Healthy Body
The increasing unhealthy nutrition habits in the Wester...
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...In Search of AIDS-Resistance Genes. Retrieved from Scientific American: http://ncoic.com/0997obrien.html
Sullivan, C. (2013, June 14). Human Population Growth Creeps Back Up. Retrieved from Scientific American: http://www.scientificamerican.com/article/human-population-growth-creeps-back-up/
Umetsu. (2002, August). Asthma: an epidemic of dysregulated immunity. Retrieved from Nature Immunology: http://ccis.stanford.edu/newsarticles/umetsu2/NIReview.pdf
Wikipedia. (2014, March). Natufian culture. Retrieved from Wikipedia: http://en.wikipedia.org/wiki/Natufian
Wikipedia. (2014, March). Natural selection. Retrieved from Wikipedia: http://en.wikipedia.org/wiki/Natural_selection#Fitness
Wong, K. (2005, January 3). Fast Food Linked to Obesity, Diabetes. Retrieved from Scientific American: http://www.scientificamerican.com/article/fast-food-linked-to-obesi/
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