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mutation. A mutation is a change in a genetic sequence. Mutations include changes as small as the substitution of a single DNA building block, or nucleotide base, with another nucleotide base ...
Polymorphismen beginnen als Mutationen. Sie sind Variationen in der DNA, die häufig in einer Bevölkerung (mit einer Prävalenz von ≥ 1%) vorkommen durch ausreichende Weitergabe oder andere Mechanismen. Die meisten Polymorphismen sind stabil und ändern nicht merklich den Phänotyp. Ein gängiges Beispiel sind die Blutgruppen (A, B, AB und O).
xiiie siècle. Emprunté du latin mutatio, « changement ». 1. Changement, transformation des personnes ou des choses, modification de leur essence, de leur nature. Provoquer, effectuer une mutation. Les alchimistes rêvaient d’obtenir la mutation du plomb en or. L’industrie a traversé nombre de mutations. Une société en pleine mutation.
Mutation and recombination can both be defined as processes that result in changes to a genome, but they are unrelated and we must make a clear distinction between them: A mutation ( Section 14.1) is a change in the nucleotide sequence of a short region of a genome ( Figure 14.1A ). Many mutations are point mutations that replace one nucleotide ...
The mutations lead to antibiotic-resistant strains of bacteria. A unique mutation is found in people in a small town in Italy. The mutation protects them from developing atherosclerosis, which is the dangerous buildup of fatty materials in blood vessels. The individual in which the mutation first appeared has even been identified.
A point mutation is a change in a single nucleotide in DNA. This type of mutation is usually less serious than a chromosomal alteration. An example of a point mutation is a mutation that changes the codon UUU to the codon UCU. Point mutations can be silent, missense, or nonsense mutations, as shown in Table 6.6.1 6.6.
There are many different ways that DNA can be changed, resulting in different types of mutation. Here is a quick summary of a few of these: Substitution. A substitution is a mutation that exchanges one base for another (i.e., a change in a single “chemical letter” such as switching an A to a G). Such a substitution could:
