A co-worker of mine told me, that there are some mutations in the genome during the life of a human body. So, the body changes genes to fit better into the surrounding environment.
My thought is now, if it is true, every generation of human beings loses some abilities which the body has not needed till the time.
A hypothetical example: in a time where education takes even more time and importance than now, would human beings lose their mechanical skills because they do little physical work?
A co-worker of mine told me, that there are some mutations in the genome during the life of a human body. So, the body changes genes to fit better into the surrounding environment.
Yes mutations accumulate during the lifetime but they are random. They are not targeted in a way that the organism adapts to the environment. Evolution happens through multiple generations and not in a single lifetime.
... every generation of human beings loses some abilities which the body has not needed till the time.
No. That does not happen.
It was once actually hypothesized by Lamarck that an organism gains or loses traits based on the use and disuse of those traits, respectively.
We now know that it is not true. A trait is not removed from the population unless it imposes a strong survival disadvantage to the population.
For more details see Why do some bad traits evolve, and good ones don't?
