Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Question
Chapter 43, Problem 2AC
Summary Introduction
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
Ch. 43.1 - define development and describe how cell division...Ch. 43.2 - Prob. 1CYLCh. 43.3 - describe early development in amphibians,...Ch. 43.3 - Prob. 2CYLCh. 43.4 - Prob. 1TCCh. 43.4 - Prob. 2TCCh. 43.4 - Does the development of a human limb, and the rest...Ch. 43.4 - Prob. 1CYLCh. 43.4 - Prob. 2CYLCh. 43.5 - Prob. 1TC
Ch. 43.5 - Prob. 1CSCCh. 43.5 - Prob. 2TCCh. 43.5 - Prob. 3TCCh. 43.5 - Prob. 1HYEWCh. 43.5 - describe human embryonic development from...Ch. 43.5 - describe the structure and function of the...Ch. 43.5 - Prob. 3CYLCh. 43.6 - Prob. 1TCCh. 43.6 - Prob. 1CYLCh. 43.6 - Prob. 2CYLCh. 43.6 - Prob. 3CYLCh. 43.6 - Prob. 2TCCh. 43 - Prob. 1MCCh. 43 - Animals with Indirect development a. develop...Ch. 43 - Prob. 3MCCh. 43 - Prob. 4MCCh. 43 - Prob. 5MCCh. 43 - Prob. 6MCCh. 43 - Prob. 7MCCh. 43 - Prob. 8MCCh. 43 - Prob. 1FIBCh. 43 - Prob. 2FIBCh. 43 - Prob. 3FIBCh. 43 - Prob. 4FIBCh. 43 - Distinguish between direct and indirect...Ch. 43 - Describe the structure and function of the four...Ch. 43 - What is gastrulation? Describe gastrulation in...Ch. 43 - Prob. 4RQCh. 43 - Prob. 5RQCh. 43 - In humans, where does fertilization occur, and...Ch. 43 - Prob. 7RQCh. 43 - Prob. 8RQCh. 43 - How do changes in the breast prepare a mother to...Ch. 43 - Prob. 10RQCh. 43 - Prob. 1ACCh. 43 - Prob. 2AC
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- ''Because of the many later developmental trans-formations that produce the elaborately structured organs, the body plan set up during gastrulation bears little resemblance to the body plan in the adult.'' Explain why or why not.arrow_forwardwhat evolutionary advantages does the amniotic egg have? explain how each component of the egg plays a role in survival of the embryoarrow_forwardExplain: Is the degenerating blastocoel visible in the frog gastrula? How much yolk protrudes through the blastopore of a frog gastrula How much yolk protrudes through the blastopore of a frog gastrula? Chickens lack a larval stage. How do they compensate for this?arrow_forward
- Why do mammalian eggs have a small concentration of yolk, while bird and reptile eggs have a large concentration of yolk?arrow_forwardDuring morphogenesis, gastrulation does which of the following?A. Gastrulation produces the ectoderm through formation of a blastocyst.B. Gastrulation produces the mesoderm to form the lining of the digestive tract.C. Gastrulation provides the mechanisms whereby cells can form the neural tube.D. Gastrulation produces the endoderm through invagination of the blastula.arrow_forwardIn your own words: Expound how the mass of inert yolk influences gastrulation in amphibians, reptiles, and mammals.arrow_forward
- Humans have three openings in an analogous place. Why is there a difference in the number of openings in pigs and humans? Describe two functions of the mesentery. Why is the ductus venosus no longer needed when the pig is born?arrow_forwardWhich statement accurately describe somites? derived from neural crest tissue on the ventral surface of the embryo series of tissue blocks lateral to the neural tube a shared derived feature seen only in gnathostomes one pair forms the pectoral girdle and the other forms the pelvic girdlearrow_forwardExplain how the formation of the primitive streak during gastrulation relevant to the primitive streak during axis formation?arrow_forward
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