Evolution Is Not Neutral — Simple Explanation

Evolution Is Not Neutral — Simple Explanation

A new scientific study says that a 60-year-old biology theory may be wrong.
The old theory said:

Most genetic changes (mutations) are neutral —
they neither help nor harm.


But the new study says:

Many mutations are actually beneficial or harmful, not neutral.

Because the environment keeps changing, a mutation that is helpful in one situation can become harmful in another.


What did the experiment show?

Scientists studied yeast for 800 generations in two environments:
one stable, one changing.

In the changing environment, helpful mutations did not spread fully, because the environment changed again before they could.

This means genes are always “chasing the environment.”


Final conclusion:

Evolution is not a neutral process.

It is a dynamic, constantly changing process.

Living organisms are always trying to adapt to the environment, but can never achieve perfect adaptation because conditions keep shifting.