when do mutations in dna occur
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DNA Mutations - Types and Examples DNA mutations happen when there are changes in the nucleotide sequence that makes up the strand of DNA. This can be caused by random mistakes in DNA replication or even an environmental influence like UV rays or chemicals.
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- Answered by The WikiAnswers® Community. Making the world better, one answer at a time. A change in the nucleotide sequence of DNA is called a mutation. A change in the nucleotide sequence of DNA is called a <b>mutation</b>.
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- A mutation occurs whenever there is a change in the genetic information of an organism, due to a variety of causes. Point mutations are single base changes, that do not affect the reading frame; that is, the mutation only makes a single change in a single codon, and everything else is undisturbed.
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What is a gene mutation and how do mutations occur? Somatic mutations that happen in a single cell early in embryonic development can lead to a situation called mosaicism. These genetic changes are not present in a parent’s egg or sperm cells, or in the fertilized egg, but happen a bit later when the embryo includes several cells.As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not.hese changes can be caused by environmental factors such as ultraviolet radiation from the sun, or can occur if a mistake is made as DNA copies itself during cell division. Acquired mutations in somatic cells (cells other than sperm and egg cells) cannot be passed on to the next generation.
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How Do Genetic Mutations Occur Other genetic mutations occur due to damage caused to the DNA sequences by lifestyle or environmental factors. Our cells have built in mechanisms that catch and repair most of the changes that occur during DNA replication or from environmental damage.
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- Alterations in DNA that occur after conception. Somatic mutations can occur in any of the cells of the body except the germ cells (sperm and egg) and therefore are not passed on to children. These alterations can (but do not always) cause cancer or other diseases.
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DNA Is Constantly Changing through the Process of Mutation Insertion or deletion of one or more nucleotides during replication can also lead to another type of mutation known as a frameshift mutation. The outcome of a frameshift mutation is complete alteration of the amino acid sequence of a protein. This alteration occurs during translation because ribosomes read the mRNA strand in terms of codons, or groups of three nucleotides. These groups are called the reading frame.
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- Spontaneous mutations occur without exposure to any obvious mutagenic agent. Sometimes DNA nucleotides shift without warning to a different chemical form (know as an isomer) which in turn will form a different series of hydrogen bonds with it's partner. This leads to mistakes at the time of DNA replication.
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-   Answer   A mutation is any change to a strand of DNA which is passed on to an organism's offspring.      DNA mutations are caused usually by chemical in … teractions or radiation (natural and manmade), and most are harmless.onfidence votes 263K. DNA mutation affects the mRna as it is the genetic profile for the being. In replication, the mutation is also replicated propagating the change in all newly developed cells.
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- exists and is an alternate of . Making the world better, one answer at a time. A change in the nucleotide sequence of DNA is called a mutation. A change in the nucleotide sequence of DNA is called a <b>mutation</b>.
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What causes DNA mutation? During this duplication process, errors sometimes occur. During replication, double strands of DNA are separated. Each strand is then copied to become another double strand. About 1 out of every 100,000,000 times, a mistake occurs during copying, which can lead to a mutation.
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What is a mutation? 1 Mutations can occur during DNA replication if errors are made and not corrected in time. 2  Mutations can also occur as the result of exposure to environmental factors such as smoking, sunlight and radiation. 3  Often cells can recognise any potentially mutation-causing damage and repair it before it becomes a fixed mutation.
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- Definition. A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.adiation can also cause double strand breaks in the DNA molecule, which the cell's repair mechanisms cannot put right. Sunlight contains ultraviolet radiation (the component that causes a suntan) which, when absorbed by the DNA causes a cross link to form between certain adjacent bases.
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- When a gene is exposed to high energy ionising radation mutations can occur. A mutation is a change in base sequence on DNA, and can be either a subsitution, addition or delet … ion. A single addition or deletion will result in a frame shift of the triplets of DNA, causing a nonsense protein to be produced.
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Why Are Baseball Seasons 162 Games Long? This week, Major League Baseball released the schedule for the 2015 season. You may have noticed that it starts later and ends later than previous seasons—but each team still plays 162 games, just as they have for decades.o when we went to two 6-team divisions [per league] in 1969 the—I think brilliant—solution was to have more games against the teams in your division, thus enabling you to preserve the 162-game season..
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Effects of Mutations on Protein Function: Missense, Nonsense, and Silent Mutations But, the truth is that most mutations are not that extreme. In biology, a mutation is any change in the nucleotide sequence of DNA. Some mutations affect large sections of DNA, and others only affect certain points along the DNA strand. These small, specific mutations are called point mutations.
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How Chromosome Mutations Occur A chromosome mutation is an unpredictable change that occurs in a chromosome. These changes are most often brought on by problems that occur during meiosis (cell division process of gametes) or by mutagens (chemicals, radiation, etc.). Deletion: This mutation results from the breakage of a chromosome in which the genetic material becomes lost during cell division. 2  The genetic material can break off from anywhere on the chromosome.
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- Mutations can occur naturally as a result of occasional errors in DNA replication. They also can be caused by exposure to radiation, alcohol, lead, lithium, organic mercury, and some other chemicals. Viruses and other microorganisms may also be responsible for them.
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- Somatic mutations occur in the DNA of certain cells during a person's lifetime and typically are not passed to future generations. There is limited evidence linking somatic mutations in mitochondrial DNA with certain cancers, including breast, colon, stomach, liver, and kidney tumors.
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- In biology, a mutation is a permanent change of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements.utations may or may not produce discernible changes in the observable characteristics (phenotype) of an organism. Mutations play a part in both normal and abnormal biological processes including: evolution, cancer, and the development of the immune system, including junctional diversity.
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What is a gene mutation and how do mutations occur? A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes.n some cases, the mutation occurs in a person’s egg or sperm cell but is not present in any of the person’s other cells. In other cases, the mutation occurs in the fertilized egg shortly after the egg and sperm cells unite.
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- Mutation can result in several different types of change in sequences. Mutations in genes can either have no effect, alter the product of a gene, or prevent the gene from functioning properly or completely. DNA damage can cause an error when the DNA is replicated, and this error of replication can cause a gene mutation that, in turn, could cause a genetic disorder. DNA damages are repaired by the DNA repair system of the cell. Each cell has a number of pathways through which enzymes recognize and repair damages in DNA.
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What is the cause of mutations in DNA? Mutations can also be caused by exposure to specific chemicals or radiation. These agents cause the DNA to break down. This is not necessarily unnatural  even in the most isolated and pristine environments, DNA breaks down. Nevertheless, when the cell repairs the DNA, it might not do a perfect job of the repair.. DNA fails to copy accurately. Most of the mutations that we think matter to evolution are naturally-occurring.. For example, when a cell divides, it makes a copy of its DNA  and sometimes the copy is not quite perfect. That small difference from the original DNA sequence is a mutation.
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- Alterations in DNA that occur after conception. Somatic mutations can occur in any of the cells of the body except the germ cells (sperm and egg) and therefore are not passed on to children.These alterations can (but do not always) cause cancer or other diseases.omatic mutations can occur in any of the cells of the body except the germ cells (sperm and egg) and therefore are not passed on to children.
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Mutation Mutations may be caused by natural events within the environment, by action or inaction of deoxyribonucleic acid (DNA) repair enzymes , and by human production of chemicals or high-energy radiation (mutagens). Mutation rates vary from organism to organism, from gene to gene, from time to time, and from place to place.