Textbook Question
True or false: The corpus luteum is retained upon implantation due to the presence of the hormone human chorionic gonadotropin (hCG).
Ch. 47 - Animal Reproduction and Development
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 47, Problem 3
Which of the following statements regarding animal development is/are correct? Select True or False for each statement.
T/FThe neural tube forms after organogenesis is complete
T/FThe blastocyst is formed during cleavage
T/FDuring cleavage, the zygote divides rapidly without growth, forming a mass of cells
T/FAnimals have two germ layers
Verified step by step guidance1
Understand the sequence of animal development stages: fertilization, cleavage, blastula formation, gastrulation, and organogenesis.
Evaluate the statement about the neural tube: The neural tube forms during neurulation, which occurs after gastrulation but before organogenesis is complete.
Consider the formation of the blastocyst: The blastocyst is formed during the cleavage stage, which is characterized by rapid cell division without growth.
Analyze the process of cleavage: During cleavage, the zygote undergoes rapid mitotic divisions, resulting in a multicellular structure without an increase in overall size.
Review the concept of germ layers: Most animals develop three primary germ layers (ectoderm, mesoderm, and endoderm) during gastrulation, not two.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Neural Tube Formation
The neural tube is a key structure in the early development of the nervous system in vertebrates. It forms during neurulation, which occurs after the initial stages of organogenesis. The neural tube eventually develops into the brain and spinal cord, highlighting its importance in embryonic development.
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Blastocyst Formation
The blastocyst is an early stage in mammalian embryonic development, formed during the cleavage phase. Cleavage involves rapid cell division without growth, resulting in a multicellular structure. The blastocyst consists of an inner cell mass, which will become the embryo, and an outer layer called the trophoblast, which contributes to placenta formation.
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Germ Layers in Animals
Germ layers are fundamental layers of cells formed during embryogenesis that give rise to all tissues and organs. Most animals, including humans, have three germ layers: ectoderm, mesoderm, and endoderm. However, some simpler animals, like cnidarians, have only two germ layers, ectoderm and endoderm, which are crucial for their basic body structures.
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Related Practice
Textbook Question
Many frogs and mice are similar in size, yet a frog egg is vastly larger than a mouse egg. Propose a plausible explanation for this difference in the egg size.
Textbook Question
Summarize the experimental evidence that Daphnia require three cues to trigger sexual reproduction. Discuss what these cues indicate about the environment.
Textbook Question
In sperm competition, what is 'second-male advantage'?
a. The observation that when females mate with two males, each male fertilizes the same number of eggs
b. The observation that when females mate with two males, the second male fertilizes most of the eggs
c. The observation that females routinely mate with at least two males before laying eggs or becoming pregnant
d. The observation that accessory fluids prevent matings by second males—for example, by forming copulatory plugs
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Textbook Question
What term describes the mode of asexual reproduction in which offspring develop from unfertilized eggs?
a. Parthenogenesis
b. Budding
c. Regeneration
d. Fission