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To explain:
The reason for the difference in shape of animal eggs which have little egg yolk and spherical blastula stage as compared to the mammalian eggs which have flat embryonic discs and virtually no egg yolk.
Introduction:
Animal eggs contain large amounts of yolk with formation of animal pole and vegetal pole. There is a blastocoel cavity with formation of deep cells and superficial cells formed during the process of cell division. There is a formation of dorsal blastopore lip during which forms archenteron, mesoderm and endoderm. Mammalian eggs have less amount of yolk which is a source of the supply of lipids and nutrients in the blood.
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Chapter 43 Solutions
Biology: Life on Earth with Physiology Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)
- A mammalian embryo puts the trophoblast into a hurried frenzy before it decides to proceed to the business of gastrulation. Is it a Clever move, or an evolutionary blunder? Explain wellarrow_forwardIn animal phyla with radial cleavages, cell fate of the embryo is?arrow_forwardWith regard to early cleavage in the sea urchin, is the entire zygote involved in early cleavage? What happens to the size of cells as the cell number increases? Do they get bigger or smaller in these early stages? How does the size of these cells compare to the size of the original fertilized egg?arrow_forward
- Describe the process of mammalian and avian gastrulationarrow_forwardFrom a 24-hour chick embryo, provide the answers in the following:Â Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seenarrow_forwardWrite in detail the process of organogenesis in vertebrates. Give one example and make diagram also.arrow_forward
- Asap what evolutionary advantages does the amniotic egg have? explain how each component of the egg plays a role in survival of the embryo.arrow_forwardRegarding mammals, amphibians, and reptiles, explain thoroughly in what way does the inert yolk's mass affects their gastrulation?arrow_forwardWhat are the correct pairings of developing and embryonic structures in the gastrulation of chickens? a. Epiblast- ectoderm c. Primary hypoblast-endoderm Read the following statements CAREFULLY: I. II. III. IV. b. Secondary hypoblast - endoderm d. Migrating cells - mesoderm The germ band needs to retract for fruit fly segments to develop properly. The formation of the sea urchin archenteron is made possible by epithelial cells that underwent epithelial-to-mesenchymal transition. Frog gastrulation involves the epiboly of endoderm cells. Chicken endoderm and mesoderm is formed through the migration of cells through both the anterior and posterior end of the primitive streak. a. All choices are true b. I & Il are true but IV is false d. IV is sometimes true c. Ill is falsearrow_forward
- Describe the step-by-step fertilization process in an amphibian. (Please include the structures involved in the process.)arrow_forwardHow is the process of gastrulation accomplished in mammalian embryos?arrow_forwardExplain how the cylindrical body shape of the human embryo isderived from the flat embryonic disc.arrow_forward
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