<span> (1) gene frequencies may be changed by migration, gene flow from another population. (2) in small populations, gene frequencies can be changed via random sampling -- this is known as genetic drift. (3) mutation pressure and (4) non-Mendelian segregation (meiotic drive) may also change gene pools. However, by far the most important agent of evolution is (5) natural selection, which operates by </span>differential reproductive success<span> of individuals.
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Answer:
When bacteria are exposed to an antibiotic, such as penicillin, they often mutate.
Explanation:
This means that part of their DNA changes, giving the antibiotic resistance to the bacteria.
In this way, the bacteria can generate a copy of their DNA and transmit it to their offspring, giving their resistance.
On other occasions, a resistant bacterium dies from causes unrelated to the antibiotic, leaving its DNA free.
If other bacteria manage to capture that DNA, it will also acquire antibiotic resistance.
Well all hypotheses are just opinions (predictions). They all need to be scientifically experimented and tested to see if they are true or not
Coal is the natural source that was mind in the past century in Virginia.
