Domanda del libro di testo
How do we know that mitotic chromosomes are derived from chromatin?
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Ch. 2 - Mitosis and Meiosis
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
Capitolo 2, Problema 1b
How do we know that DNA replication occurs during interphase, not early in mitosis?
Guida verificata passo dopo passo1
Understand the question: The problem asks us to explain how scientists determined that DNA replication occurs during interphase and not during early mitosis. This involves understanding the experimental evidence and reasoning behind this conclusion.
Step 1: Recall the phases of the cell cycle. The cell cycle consists of interphase (G1, S, and G2 phases) and the mitotic phase (prophase, metaphase, anaphase, and telophase). DNA replication specifically occurs during the S phase of interphase.
Step 2: Review experimental evidence. Scientists used radioactive labeling experiments, such as incorporating tritiated thymidine (a radioactive form of thymine) into newly synthesized DNA. Cells were then observed under autoradiography to determine when DNA synthesis occurred.
Step 3: Analyze the results of these experiments. The radioactive labeling was detected in cells during interphase, specifically in the S phase, but not during mitosis. This provided direct evidence that DNA replication occurs before mitosis begins.
Step 4: Consider the reasoning. For mitosis to proceed correctly, the DNA must already be replicated so that each daughter cell receives an identical set of chromosomes. This functional requirement aligns with the experimental evidence that DNA replication is completed during interphase.
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DNA Replication
DNA replication is the process by which a cell duplicates its DNA before cell division. This occurs during the S phase of interphase, ensuring that each daughter cell receives an identical set of chromosomes. Understanding the timing of DNA replication is crucial for distinguishing between interphase and mitotic phases.
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11:59
Steps to DNA Replication
Interphase
Interphase is the phase of the cell cycle where the cell prepares for division, consisting of G1, S, and G2 phases. During interphase, the cell grows, synthesizes proteins, and replicates its DNA. Recognizing interphase as the stage for DNA replication helps clarify why replication does not occur during mitosis.
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09:46Mitosis Steps
Mitosis
Mitosis is the process of cell division that results in two genetically identical daughter cells. It is divided into several stages: prophase, metaphase, anaphase, and telophase. Understanding that mitosis follows DNA replication in interphase is essential for grasping the overall cell cycle and the timing of genetic material distribution.
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09:46Mitosis Steps
Pratica correlata
Domanda del libro di testo
Write a short essay that contrasts mitosis and meiosis, including their respective roles in organisms, the mechanisms by which they achieve their respective outcomes, and the consequences should either process fail to be executed with absolute fidelity.
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Domanda del libro di testo
How do we know that chromosomes exist in homologous pairs?
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Domanda del libro di testo
What role do the following cellular components play in the storage, expression, or transmission of genetic information?
(a) Chromatin
(b) Nucleolus
(c) Ribosome
(d) Mitochondrion
(e) Centriole
(f) Centromere
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