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scilover89
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Mutation is one of the important factors to cause evolution, but besides radiation, what cause mutation to happen? Is it happen naturally?
LURCH said:I have read of some experiments in the lab where starvation of single cell organisms was found to be a cause of mutation. I believe the explanation given was that malnutrition weekend the DNA polymerase causing flaws in replication. These flaws were, of course, random but in laboratory experiments they would occasionally produce beneficial results. The specific experiment I read about was some bacteria only capable of metabolizing sucrose being placed in an environment with very little sucrose, but plentiful fructose. Apparently, as starvation began to set in, the rate of mutation among new generations of bacteria increased sharply. Eventually, one of these mutations resulted in individual capable of metabolizing fructose. This individual then reproduced prolifically to the very rich growth medium.
I do not know how well-verified this experiment is but, if it proves true, then it would certainly hint at the possibility that other environmental pressures may contribute to mutation as well.
scilover89 said:Since virus can alter the DNA in a cell, is it possible that virus is another element of evolution?
There are three main types of mutations: point mutations, insertions, and deletions. Point mutations involve a change in a single nucleotide base, while insertions and deletions involve the addition or removal of one or more nucleotides in a DNA sequence.
Mutations can occur spontaneously or be induced by external factors such as radiation, chemicals, or viruses. They can also occur during DNA replication or as a result of errors in DNA repair mechanisms.
Some common factors that can cause mutations include exposure to UV radiation, X-rays, and certain chemicals. Inherited genetic disorders and errors during DNA replication can also lead to mutations.
While most mutations have negative effects, some can actually be beneficial. For example, mutations can sometimes lead to increased genetic diversity and help organisms adapt to changing environments.
Mutations play a crucial role in evolution by providing the genetic variation necessary for natural selection to occur. Over time, these mutations can lead to the emergence of new traits and species.