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How does an enzyme function? Why are enzymes essential for living organisms on Earth?
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Ch. 13 - Translation and Proteins
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
Capitolo 13, Problema 19
Several amino acid substitutions in the α and β chains of human hemoglobin are shown in the following table.
Using the code table, determine how many of them can occur as a result of a single-nucleotide change.
Guida verificata passo dopo passo1
Step 1: Identify the codons for the normal and substituted amino acids using the standard genetic code table. Each amino acid is encoded by one or more codons (triplets of nucleotides).
Step 2: For each hemoglobin variant, write down the codon(s) that could encode the normal amino acid and the codon(s) that could encode the substituted amino acid.
Step 3: Compare the codons for the normal and substituted amino acids to determine if the substitution can be caused by a single-nucleotide change. This means checking if changing one nucleotide in the normal codon can produce a codon for the substituted amino acid.
Step 4: Count how many of the amino acid substitutions in the table can be explained by a single-nucleotide change in the codon.
Step 5: Summarize your findings by stating the total number of substitutions that can occur due to a single-nucleotide change, based on your codon comparisons.
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Genetic Code and Codon Table
The genetic code consists of nucleotide triplets called codons, each specifying an amino acid. Understanding the codon table is essential to determine how a single-nucleotide change (point mutation) can alter a codon to code for a different amino acid, leading to amino acid substitutions in proteins.
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11:43
The Genetic Code
Missense Mutations and Single-Nucleotide Changes
Missense mutations are point mutations where a single nucleotide change results in a codon that codes for a different amino acid. Identifying whether an amino acid substitution can arise from a single-nucleotide change requires comparing codons of the original and substituted amino acids.
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09:49Point Mutations
Hemoglobin Structure and Variants
Hemoglobin is composed of α and β chains, each with specific amino acid sequences. Variants arise from amino acid substitutions in these chains, which can affect function. Understanding the location and nature of these substitutions helps relate genetic mutations to protein changes.
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07:10Chromosome Structure
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Three independently assorting genes (A, B, and C) are known to control the following biochemical pathway that provides the basis for flower color in a hypothetical plant:
Three homozygous recessive mutations are also known, each of which interrupts a different one of these steps. Determine the phenotypic results in the F1 and F2 generations resulting from the P1 crosses of true-breeding plants listed here:
speckled (AABBCC) × yellow (AAbbCC)
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Domanda del libro di testo
Three independently assorting genes (A, B, and C) are known to control the following biochemical pathway that provides the basis for flower color in a hypothetical plant:
Three homozygous recessive mutations are also known, each of which interrupts a different one of these steps. Determine the phenotypic results in the F1 and F2 generations resulting from the P1 crosses of true-breeding plants listed here:
colorless (aaBBCC) × green (AABBcc)
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List as many different categories of protein functions as you can. Wherever possible, give an example of each category.
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Domanda del libro di testo
Three independently assorting genes (A, B, and C) are known to control the following biochemical pathway that provides the basis for flower color in a hypothetical plant:
Three homozygous recessive mutations are also known, each of which interrupts a different one of these steps. Determine the phenotypic results in the F1 and F2 generations resulting from the P1 crosses of true-breeding plants listed here:
yellow (AAbbCC) × green (AABBcc)
531
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