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True or false: The corpus luteum is retained upon implantation due to the presence of the hormone human chorionic gonadotropin (hCG).
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Ch. 47 - Animal Reproduction and Development
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 47, Problema 6
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.
Guida verificata passo dopo passo1
Understand the reproductive strategies: Frogs are external fertilizers, meaning they lay their eggs in water and fertilization occurs outside the female's body. Mice, on the other hand, are internal fertilizers with fertilization occurring inside the female's body.
Consider the survival rates: Since frog eggs are laid in water and are exposed to predators and environmental conditions, they are produced in large quantities with each being relatively large to house more yolk to sustain the embryo until it can fend for itself.
Analyze the development process: The larger size of frog eggs is also due to the need for more yolk to support the development of the embryo directly into a tadpole, which must be somewhat self-sufficient. In contrast, mouse embryos develop internally and are nourished directly by the mother through the placenta.
Examine the maternal investment: Mice invest in fewer eggs but provide prolonged internal protection and postnatal care, which increases the survival chance of each offspring. This allows mouse eggs to be smaller as the embryo relies less on the egg's initial yolk content.
Reflect on evolutionary adaptations: The differences in egg size between frogs and mice reflect their evolutionary adaptations to their respective environments and reproductive strategies, optimizing their survival and reproductive success.
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Oviparity vs. Viviparity
Oviparity refers to the reproductive strategy where organisms lay eggs that develop outside the mother's body, as seen in frogs. In contrast, viviparity involves live birth, typical of many mammals like mice. The differences in reproductive strategies can influence egg size, with oviparous species often producing larger eggs to provide sufficient nutrients for the developing embryo.
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Dominant vs. Recessive Alleles
Nutritional Investment in Eggs
The size of an egg often correlates with the amount of yolk it contains, which serves as a nutrient source for the developing embryo. Frogs, which lay eggs in aquatic environments, produce larger eggs with more yolk to support the embryo during its early development stages, while mice, which give live birth, invest in fewer but more developed offspring.
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05:58Nutritional Diversity Among Microbes
Environmental Adaptations
Different species adapt their reproductive strategies based on environmental conditions. Frogs typically lay eggs in water, where larger eggs can help ensure survival against predation and environmental challenges. Mice, being terrestrial and nurturing their young internally, have evolved to produce smaller eggs that develop into more complex organisms before birth, reflecting their different ecological niches.
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Percorso guidato
05:24Adaptive Radiation
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