Textbook Question
During what genetic process are lampbrush chromosomes present in vertebrates?
Ch. 11 - Chromosome Structure and DNA Sequence Organization
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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Table of contents
- 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
Chapter 11, Problem 9
Describe the molecular composition and arrangement of the components in the nucleosome.
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Begin by identifying the core components of a nucleosome, which include DNA and histone proteins.
Explain that the nucleosome consists of approximately 147 base pairs of DNA wrapped around a histone octamer.
Describe the histone octamer as being composed of two copies each of four different histone proteins: H2A, H2B, H3, and H4.
Clarify that the DNA wraps around the histone octamer in about 1.65 left-handed superhelical turns, which helps compact the DNA.
Mention the role of the linker histone H1, which binds to the DNA between nucleosomes and helps stabilize the higher-order chromatin structure.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleosome Structure
A nucleosome is the fundamental unit of chromatin, consisting of DNA wrapped around a histone protein core. It compacts DNA and regulates its accessibility, playing a key role in gene expression and DNA packaging.
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Chromosome Structure
Histone Proteins
Histones are positively charged proteins (H2A, H2B, H3, and H4) that form an octamer core around which DNA wraps. Their interaction with DNA helps neutralize negative charges and facilitates tight DNA packaging.
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05:05Proteins
DNA-Histone Interaction
Approximately 147 base pairs of DNA wrap around the histone octamer in about 1.65 turns. This interaction is stabilized by electrostatic forces and hydrogen bonds, enabling efficient DNA compaction while allowing dynamic access for cellular processes.
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Related Practice
Textbook Question
Describe the transitions that occur as nucleosomes are coiled and folded, ultimately forming a chromatid.
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Textbook Question
Contrast the various categories of repetitive DNA.
Textbook Question
Describe the sequence of research findings that led to the development of the model of chromatin structure.
Textbook Question
Why might we predict that the organization of eukaryotic genetic material will be more complex than that of viruses or bacteria?
Textbook Question
Provide a comprehensive definition of heterochromatin and list as many examples as you can.