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Why are X rays more potent mutagens than UV radiation?
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Ch. 15 - Gene Mutation, DNA Repair, and Transposition
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
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Klug 12th EditionCh. 15 - Gene Mutation, DNA Repair, and TranspositionProblema 11
Klug 12th EditionCh. 15 - Gene Mutation, DNA Repair, and TranspositionProblema 11Capitolo 15, Problema 11
Why are frameshift mutations likely to be more detrimental than point mutations, in which a single pyrimidine or purine has been substituted?
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Understand the nature of point mutations: these involve the substitution of a single nucleotide base (a purine or pyrimidine) with another, which may or may not change the amino acid sequence due to the redundancy of the genetic code.
Recognize that frameshift mutations occur when nucleotides are inserted or deleted in numbers not divisible by three, causing a shift in the reading frame of the mRNA during translation.
Analyze how the reading frame shift alters the grouping of codons downstream of the mutation, potentially changing every amino acid encoded after the mutation site.
Consider the consequences of this shift: it often leads to the production of a completely different and usually nonfunctional protein, or introduces premature stop codons that truncate the protein.
Compare this to point mutations, which may only affect a single amino acid or sometimes have no effect at all (silent mutations), explaining why frameshift mutations are generally more detrimental.
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Frameshift Mutations
Frameshift mutations occur when nucleotides are inserted or deleted from the DNA sequence, altering the reading frame of the gene. This shift changes every codon downstream, often resulting in a completely different and nonfunctional protein. Because the entire amino acid sequence is affected, frameshift mutations tend to have severe consequences.
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09:49
Point Mutations
Point Mutations
Point mutations involve the substitution of a single nucleotide base, such as replacing one purine or pyrimidine with another. These mutations may cause a silent, missense, or nonsense change, often affecting only one amino acid or sometimes none, making their impact generally less severe than frameshift mutations.
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09:49Point Mutations
Genetic Code and Reading Frame
The genetic code is read in triplets called codons, each coding for a specific amino acid. Maintaining the correct reading frame is crucial for producing functional proteins. Frameshift mutations disrupt this frame, while point mutations usually do not, explaining why frameshifts are more detrimental.
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11:43The Genetic Code
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