Domanda del libro di testo
Triploid (3n) watermelons, which are seedless, are produced by crossing a tetraploid (4n) strain with a diploid (2n) plant. Explain why this mating produces a triploid individual.
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Ch. 13 - Meiosis
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 13, Problema 10b
A species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. Why might the ability to withstand drying reduce any potential advantage of sexual reproduction in this rotifer species?
Guida verificata passo dopo passo1
Understand the role of sexual reproduction: Sexual reproduction typically provides genetic diversity, which can be advantageous for adapting to changing environments or resisting pathogens.
Consider the rotifer's environment: The rotifer's ability to withstand drying and rehydrate in new areas means it can escape environments where pathogens are present, reducing the need for genetic diversity to combat these pathogens.
Evaluate the impact of drying on pathogens: Since the fungus pathogen cannot survive drying, the rotifers are naturally protected from this threat when they dry out, diminishing the need for sexual reproduction as a defense mechanism.
Analyze the trade-off: The rotifer's ability to survive drying and escape pathogens may outweigh the benefits of genetic diversity provided by sexual reproduction, making asexual reproduction more advantageous in this context.
Conclude the hypothesis: The ability to withstand drying likely reduces the advantage of sexual reproduction because the rotifers can avoid pathogens without needing genetic diversity, thus favoring asexual reproduction.
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Asexual Reproduction
Asexual reproduction is a mode of reproduction where offspring are produced by a single organism without the involvement of gametes. This process results in genetically identical offspring, allowing rapid population growth and survival in stable environments. In rotifers, asexual reproduction eliminates the need for mates, which can be advantageous in fluctuating environments where finding a partner is challenging.
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05:44
Sexual and Asexual Reproduction
Desiccation Tolerance
Desiccation tolerance refers to an organism's ability to survive extreme drying conditions. Rotifers can enter a dormant state when their environment dries, allowing them to be transported to new locations by wind. Upon rehydration, they resume normal activity, which helps them escape pathogens like fungi that cannot survive desiccation, thus providing a survival advantage without the need for genetic diversity from sexual reproduction.
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06:30Osmolarity Factors for Microbial Growth
Pathogen Resistance
Pathogen resistance is the ability of an organism to withstand or eliminate infections by pathogens. In rotifers, desiccation acts as a natural defense mechanism against fungal pathogens that cannot survive drying. This reduces the evolutionary pressure to develop genetic diversity through sexual reproduction, as the rotifers can effectively rid themselves of pathogens by simply drying out and relocating.
Video consigliato:
08:59Pathogen Defenses
Pratica correlata
Domanda del libro di testo
Meiosis results in independent assortment of egg-derived and sperm-derived chromosomes. If 2𝑛=4 for a given organism, and there is no crossing over, what is the chance that a gamete produced by this diploid organism will receive only sperm-derived chromosomes? In domestic cats, 2𝑛=38. What is the chance that a cat gamete contains only egg-derived chromosomes?
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Domanda del libro di testo
Select True or False for each statement.
T/FLinked genes are always inherited together.
T/FGenetic map distances measure the number of nucleotides between a pair of genes.
T/FThe farther apart genes are on a chromosome, the more likely there is to be a crossover between these genes during meiosis.
T/FCrossing over occurs between genes on different homologs of a homologous chromosome pair.
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Domanda del libro di testo
A species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. Design an experimental study to test this hypothesis.
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