Textbook Question
Our closest primate relative, the chimpanzee, has a diploid number of 2n = 48. For each of the following stages of M phase, identify the number of chromosomes present in each cell.
End of mitotic telophase
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Ch. 3 - Cell Division and Chromosome Heredity
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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Table of contents
- Ch. 1 - The Molecular Basis of Heredity, Variation, and Evolution64
- Ch. 2 - Transmission Genetics144
- Ch. 3 - Cell Division and Chromosome Heredity81
- Ch. 4 - Gene Interaction87
- Ch. 5 - Genetic Linkage and Mapping in Eukaryotes103
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages73
- Ch. 7 - DNA Structure and Replication71
- Ch. 8 - Molecular Biology of Transcription and RNA Processing79
- Ch. 9 - The Molecular Biology of Translation110
- Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization100
- Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination86
- Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage90
- Ch. 13 - Regulation of Gene Expression in Eukaryotes38
- Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics72
- Ch. 15 - Recombinant DNA Technology and Its Applications69
- Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective49
- Ch. 17 - Organelle Inheritance and the Evolution of Organelle Genomes27
- Ch. 18 - Developmental Genetics43
- Ch. 19 - Genetic Analysis of Quantitative Traits66
- Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels105
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Not the one you use?Change textbook
Chapter 3, Problem 2d
Our closest primate relative, the chimpanzee, has a diploid number of 2n = 48. For each of the following stages of M phase, identify the number of chromosomes present in each cell.
Early mitotic prophase
Verified step by step guidance1
Understand the diploid number: The diploid number (2n) represents the total number of chromosomes in a somatic cell. For chimpanzees, 2n = 48, meaning there are 48 chromosomes in a diploid cell.
Recall the stage of mitosis: Early mitotic prophase is the stage where chromosomes begin to condense, but the number of chromosomes in the cell remains unchanged from the diploid number.
Determine the chromosome count: Since no division or separation has occurred yet in early mitotic prophase, the number of chromosomes in the cell remains equal to the diploid number, which is 48.
Consider chromatid duplication: Although the chromosomes have duplicated their DNA during the S phase of the cell cycle, they are still counted as single chromosomes because sister chromatids are attached at the centromere.
Conclude the chromosome count: In early mitotic prophase, the cell contains 48 chromosomes, each consisting of two sister chromatids, but the chromosome count remains 48.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Diploid Number
The diploid number (2n) refers to the total number of chromosomes in a somatic cell, where chromosomes exist in pairs. In the case of chimpanzees, the diploid number is 48, meaning there are 24 pairs of homologous chromosomes. This concept is crucial for understanding how chromosomes are organized and distributed during cell division.
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M Phase of the Cell Cycle
M Phase, or mitotic phase, is the stage of the cell cycle where cell division occurs, encompassing both mitosis and cytokinesis. During this phase, the replicated chromosomes condense and align for separation. Understanding M Phase is essential for determining the number of chromosomes present at various stages of cell division, such as prophase.
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Chromosome Structure in Mitosis
During early mitotic prophase, chromosomes become visible as distinct structures due to the condensation of chromatin. Each chromosome consists of two sister chromatids joined at the centromere. At this stage, although the chromatids are still attached, the total number of chromosomes is counted as the number of centromeres, which remains 48 for chimpanzees, reflecting their diploid state.
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Related Practice
Textbook Question
Our closest primate relative, the chimpanzee, has a diploid number of 2n = 48. For each of the following stages of M phase, identify the number of chromosomes present in each cell.
Meiotic metaphase I
669
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Textbook Question
Our closest primate relative, the chimpanzee, has a diploid number of 2n = 48. For each of the following stages of M phase, identify the number of chromosomes present in each cell.
End of meiotic anaphase II
696
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Textbook Question
Our closest primate relative, the chimpanzee, has a diploid number of 2n = 48. For each of the following stages of M phase, identify the number of chromosomes present in each cell.
Mitotic metaphase
541
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Textbook Question
Our closest primate relative, the chimpanzee, has a diploid number of 2n = 48. For each of the following stages of M phase, identify the number of chromosomes present in each cell.
Early prophase I
403
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Textbook Question
In a test of his chromosome theory of heredity, Morgan crossed a female Drosophila with red eyes to a male with white eyes. The females were produced from Cross A, shown in the Figure below. Predict the offspring Morgan would have expected under his hypothesis that the gene for eye color is on the X chromosome in fruit flies.
572
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