why we not able to see evolution changes in human now?

Answer 1

There are some terrible answers in here, although they're on the right path at least. My answer is long, but this first thing I say is why you don't observe changes, and everything after is why what you might think (or be told) you observe is probably wrong.

Anyhow, first issue is you need the proper perspective. Come back and check on us in 100,000 years and you might see differences.

You would also need to take into consideration things like increasing hight being related to better nutrition and other factors.

Another factor to consider is that evolution, or survival of the fittest is the selection of random mutations that increase the fitness of a species in its environment. Given that we can now change our environment pretty much at will, the selective pressure on humans is not particularly selective any longer.

You should also consider that as long as people are able to reproduce, they will pass their genetic material on, even if it's less fit or gives them increased chances for diseases. Things like Alzheimers or Parkinson's disease that affect people later in life won't be selected against because people carrying those genetic factors are able to reproduce before they die from disease. Short of a eugenics program you won't see "evolution" in that direction.

I also don't buy the wisdom tooth argument at all. Unless people are dying from having their wisdom teeth come in, which until the advent of good dentistry probably wasn't an issue as teeth were falling out anyhow, leaving room. In more recent times, if your teeth weren't falling out, then I guess it would be possible that incoming wisdom teeth could lead to your death. given the time frame for the arrival of wisdom teeth this theoretically could prohibit reproduction, but how many people do you know that died from impacted wisdom teeth? none. therefor there isn't any selective pressure on that trait either.

a sample size of 4 with 1 not having it (I dont have them my family does) is worthless. i have my wisdom teeth, haven't had any teeth pulled, and my mouth is fine. my parents and brother had to have their wisdom teeth pulled. does that mean im more evolved? no, it means my mouth is a little bigger.

and finally, don't fall into the trap of "use and disuse". The theory that evolution is directed "use and disuse" of a trait or feature has been debunked, but for some reaspon it appeals to people who work diligently to find real world traits that they percieve to fall into this category. i don't know why peopel cling to that particular theory so much, but I'm guessing it's because it is way more simple to explain and understand than natural selection and survival of the fittest.

Answer 2

Partly because there is no pressure to cause selection, and partly because there is no longer the isolation of populations which would make evolution obvious. Also, partly because it takes time: you have been watching humanity for a few tens of years, but evolution from the most immediate precursor took tens of thousands of years. Evolution is in fact proceeding now, but invisibly: people are evolving to better fight off diseases, while the disease bugs are evolving to better attack humans. Ask about resistant bacteria at any hospital to find out more about that sad story, and hope that the pharmaceutical companies can come up with the drug for your bug before the bug comes for you...

Answer 3

Well first off one must specify if the evolution you are talking about is macroevolution or microevolution. In macroevolution the changes are so great that it requires the formation of a new species id est going from cartilaginous flipper to ossified hand. Microevolution on the other hand is evolution that happens on a much smaller scale that usually just makes a certain species more adept to living in their environment id est antibiotic resistance in bacteria. But in either sense evolution takes many hundred thousands of years(depending on the generation length) to impact a species and to bluntly put it humans just do not live long enough. In bacteria some generations are seperated by just 8 minutes short enough for microevolution to occur that humans can witness but the formation of a new species of bacteria would take too long for a human to witness. Ergo human evolution has taken so long that Homo sapiens has only walked this planet for about 200,000 years and the earth is appx. 4.5 billion years old. You do the math Homo sapiens has only lived on earth for about 4.4x10^ -5 or 0.00044 or in lay-mans terms 0.044 % of geologic time.

Answer 4

the invention and sharing of understanding is greater. In evolution each and every thing is interconnected with the point to assert what the consequence would be is a complicated wager. you will see the consequence of internet inspite of the undeniable fact that via activities which comprise Haiti. Mass media pronounced the ordinary public approximately what handed off and that's how they have been given money. If this counsel did no longer unfold Haitians could have suffered great losses. In previous human evolution circumstances a disaster might have wiped out majority of the haitians, with this help it hasn't. of direction there are different advantages and cons to internet with suitable to human evolution

Answer 5

We do still see evolution in humans. You just have to understand that evolution is a slow gradual process that often cannot be seen in the few generations that we are able to observe.

Answer 6

The Q is actually 2-fold
a. Like other factors of earth, it has sort of stabilized.. like liquid with energy sort of spilling to an equilibrium stage... coz we have come far since the origination of life now...
b. Even if there is evolution - it takes thousands of years for it to take shape, there were no films or photos in early days, so u may have to wait till year (2006 ==> 200,006...)AD!!

Don't believe it, then make a cartoon, don't see it on TV, draw each bugs bunny by hand,, u will understand..

Answer 7

I was gonna say have you seen my inlaws all together on Christmas after everyone is good and hammered and in the middle of our Yearly Christmas Brawl (Cousin Merl drives all the way from New Yourk City,for the occasion) but I just saw Micheal Jackson on TV and I think that is a better answer by far than my spooky old inlaws. . Not to mention all the really good serious answers you got. Great Job you guys!

Answer 8

it is definately happening Its a very slow n steady process which we cant see coz its requires constant observation and latest updates in medicines as it is said that each time some disease spreads and there is some change observed in the bacteria
Thats nothing but a sign of evolution at a smaller level
Thats all could be said about it rest u can gauge an idea............

Answer 9

It is to slow. To see a great change, it would last thousand year
But you can notice some evolution i, the size of individuals who are taller Than the parents and grand parents

Answer 10

Because it is such a slow process. About 11 years ago I went to the dentist and was told I didn't have wisdom teeth. My husband, on the other hand, had all four and had to have them removed. I recently went to the dentist again and was told that has to do with humans changing. I was told that our mouths are getting smaller and the head is getting larger.