Textbook Question
Which of these characteristics does not apply to cnidarians?
a. Are diploblastic
b. Possess a gastrovascular cavity with one opening
c. Undergo metamorphosis
d. Have a central nervous system
Ch. 30 - An Introduction to Animals
Freeman8th EditionBiological ScienceISBN: 9780138276263
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Table of contents
- 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
Chapter 30, Problem 1
True or false? Multicellularity is homologous in animals and land plants.
Verified step by step guidance1
Understand the term 'homologous' in a biological context, which refers to traits or structures that are derived from the same evolutionary origin or ancestral source.
Recognize that multicellularity refers to organisms composed of more than one cell, which can differentiate and perform specialized functions.
Research the evolutionary origins of multicellularity in animals and land plants to determine if they share a common ancestor specifically for this trait.
Analyze whether the development of multicellularity in animals and land plants occurred independently or from a shared multicellular ancestor.
Conclude whether the statement is true or false based on whether multicellularity in animals and land plants originated from the same ancestral source (homologous) or through separate evolutionary events (analogous).
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Homology
Homology refers to the similarity in structure or function between different species that arises from a common ancestor. In biology, homologous traits indicate evolutionary relationships and can be used to trace lineage. Understanding homology is crucial for determining whether multicellularity in animals and land plants shares a common evolutionary origin.
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Homologous Chromosomes
Multicellularity
Multicellularity is the condition of being composed of multiple cells that work together to form a complex organism. This trait allows for specialization of cells, leading to more efficient functioning and adaptation. The evolution of multicellularity is a significant event in the history of life, occurring independently in various lineages, including animals and plants.
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02:09Unicellular vs. Multicellular
Convergent Evolution
Convergent evolution occurs when different species independently evolve similar traits or features as a result of adapting to similar environments or ecological niches. This concept is important in understanding that multicellularity in animals and land plants may not be homologous, as it could have arisen through convergent evolution rather than from a shared ancestor.
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05:22Convergent and Divergent Evolution