Textbook Question
If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I will be
a. 0.25x
b. 0.5x
c. x
d. 2x
Ch. 13 - Meiosis and Sexual Life Cycles
Urry11th EditionCampbell BiologyISBN: 9789357423311
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Table of contents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle10
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance7
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology8
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth6
- Ch. 26 - Phylogeny and the Tree of Life7
- Ch. 27 - Bacteria and Archaea8
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants7
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development8
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition10
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System6
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction8
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology10
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Chapter 13, Problem 6b
The diagram shows a cell in meiosis. Describe the makeup of a haploid set and a diploid set.
Verified step by step guidance1
Understand the concept of ploidy: Ploidy refers to the number of sets of chromosomes in a cell. Haploid cells have one set of chromosomes, while diploid cells have two sets.
Identify the makeup of a haploid set: A haploid set contains one complete set of chromosomes, which means it has one chromosome from each homologous pair. In humans, this is 23 chromosomes.
Identify the makeup of a diploid set: A diploid set contains two complete sets of chromosomes, which means it has both chromosomes from each homologous pair. In humans, this is 46 chromosomes.
Relate the concept to meiosis: Meiosis is the process by which diploid cells divide to produce haploid gametes. During meiosis, the chromosome number is reduced from diploid to haploid.
Visualize the process: In the diagram, identify the stage of meiosis and observe how the chromosomes are arranged. This will help you understand how the cell transitions from diploid to haploid.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Meiosis
Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells. It consists of two consecutive divisions: meiosis I and meiosis II. This process is crucial for sexual reproduction, as it ensures genetic diversity through recombination and independent assortment of chromosomes.
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Meiosis I & Meiosis II
Haploid Set
A haploid set refers to a single set of chromosomes, which is half the full complement found in diploid cells. In humans, haploid cells contain 23 chromosomes, representing one chromosome from each homologous pair. Haploid cells are typically gametes, such as sperm and egg cells, which combine during fertilization to form a diploid zygote.
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04:14Haploid vs. Diploid Cells
Diploid Set
A diploid set consists of two complete sets of chromosomes, one inherited from each parent. In humans, diploid cells contain 46 chromosomes, organized into 23 pairs. Diploid cells make up most of the body's tissues and organs, providing the genetic material necessary for growth, development, and maintenance of the organism.
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Related Practice
Textbook Question
If we continue to follow the cell lineage from question 4, then the DNA content of a single cell at metaphase of meiosis II will be
a. 0.25x
b. 0.5x
c. x.
d. 2x
1
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Textbook Question
The diagram shows a cell in meiosis. Label the appropriate structures with these terms: chromosome (label as duplicated or unduplicated), centromere, kinetochore, sister chromatids, nonsister chromatids, homologous pair (use a bracket when labeling), homolog (label each one), chiasma, sister chromatid cohesion, and gene loci, labeling the alleles of the F and H genes.
Textbook Question
The following diagram shows a cell in meiosis. Identify the stage of meiosis shown.
Textbook Question
Assume that genes A and B are on the same chromosome and are 50 map units apart. An animal heterozygous at both loci is crossed with one that is homozygous recessive at both loci. What percentage of the offspring will show recombinant phenotypes resulting from crossovers? Without knowing these genes are on the same chromosome, how would you interpret the results of this cross?
Textbook Question
Two genes of a flower, one controlling blue (B) versus white (b) petals and the other controlling round (R) versus oval (r) stamens, are linked and are 10 map units apart. You cross a homozygous blue oval plant with a homozygous white round plant. The resulting F1 progeny are crossed with homozygous white oval plants, and 1,000 offspring plants are obtained. How many plants of each of the four phenotypes do you expect?