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Is it true that the same mutation could be advantage in some environments but deleterious in others?
Wiki User
∙ 8y ago
No. They are selected for by the environment.
Think of all the people in your town. Some are short and some are taller. What if there were a very narrow and low doorway that all had to go through? The shorter ones would do better than the taller ones.
In this case, the environment (doorway) selects for genes that are already there but hadn't needed to be used before. Now, shortness is "selected" by the environment. If those going though the doorway were the only ones to get the "other side", their children will also be shorter.
You can imagine another shorter doorway and so on, until people on the very last side would be very short compared to those who first started the journey.
There were gene variations that were already there and they are selected as they give the person with it a better chance to pass on them.
Wiki User
∙ 10y ago
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What are some benefits of mutations to DNA?
Mutations allow new versions of DNA combinations to occur. These can be harmful, benign or beneficial. If they are harmful, they tend to be self eliminating, unless they only show up after breeding age. If they are benign, they may not influence the species. If they are beneficial, they create improved varieties of the organisms, resulting in greater diversity and therfore greater adaptability in the species.
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PKU (phenylketonuria) is a point mutation, specifically an autosomal recessive genetic disorder caused by a mutation in the PAH gene. This mutation leads to impaired metabolism of the amino acid phenylalanine. It is not a frameshift mutation, which would involve an insertion or deletion of nucleotides, shifting the reading frame of the gene.
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