Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 8, Problem 12RQ
What is meant by “induction” in embryology? Describe the famous organizer experiment of Spemann and Mangold and explain its significance.
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Chapter 8 Solutions
Loose Leaf For Integrated Principles Of Zoology
Ch. 8 - What is meant by epigenesis? How did Kaspar...Ch. 8 - How is an egg (oocyte) prepared during oogenesis...Ch. 8 - Describe events that follow contact of a...Ch. 8 - What is meant by the term activation in...Ch. 8 - How does amount of yolk affect cleavage? Compare...Ch. 8 - What is the difference between radial and spiral...Ch. 8 - What other developmental hallmarks are often...Ch. 8 - What is indirect development?Ch. 8 - Using sea star embryos as an example, describe...Ch. 8 - What is the difference between schizocoelous and...
Ch. 8 - Describe two different experimental approaches...Ch. 8 - What is meant by induction in embryology? Describe...Ch. 8 - What are homeotic genes and what is the homeobox...Ch. 8 - What is the embryological evidence that...Ch. 8 - What are the four extraembryonic membranes of...Ch. 8 - What is the fate of the four extraembryonic...Ch. 8 - Explain what the growth cone that Ross Harrison...Ch. 8 - Name two organ-system derivatives of each of the...Ch. 8 - Prob. 19RQCh. 8 - SCNT makes possible therapeutic cloning. What are...
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- Explain why axis-determination is a crucial aspect of embryonic development. Explain how maternal-effect genes encode cytoplasmic factors that play a role in axis determination.arrow_forwardCarefully distinguish between the terms differentiation and determination. Which phenomenon occurs initially during development?arrow_forwardWhich of the following is true about cleavage in C. elegans. Choose all possible answers. a) Exhibit a rotational holoblastic cleavage b) During the second division, the dorsal-ventral axis is determined. c) Cells are enveloped to an egg membrane called a chorion. d) Each of symmetric division process one differentiated descendant. e) At the transition between the 2 and 4-cell stages, the right-left axis can be seen.arrow_forward
- What is true of the Progress Zone model? a) the length of time a cell resides in the progress zone dictates its identity along the proximodistal axis b) it is consistent with the outcome of removing the AER at successively later stages of limb development c) once a cell leaves the progress zone, its identity is established along the proximodistal axis d) cells of the progress zone are stimulated to divide by the AER e) all of the above You isolate a new mutant chicken strain in which limb outgrowth is severely curtailed. Limbdevelopment begins and the AER initially forms, but the AER then degenerates and subsequent development of the limb is aborted. Which of the following is a possible explanation for the AER phenotype? a) the mutant gene may function cell autonomously in the AER b) the mutant gene may function cell-nonautonomously in the limb bud mesenchyme c) the mutant gene may interfere with the feedback loop between the mesenchyme and AER d) all of the abovearrow_forwardWhat parts are persistent throughout the development of the embryo? Why are these presentin all the stages? Please explain thoroughly, and if possible, avoid copy and pasting from previous answers.arrow_forwardWhat statement best describes the difference between "fate maps" and "specification"? If cells are transplanted from their normal region in an embryo to a different region in a recipient embryo, such cells will alter their fate, but not their specification. Cell fate map describes the allocation of cells to the germ layers, ectoderm, mesoderm, or endoderm, whereas specification describes the exact tissues that each cell will ultimately become. The fate map of an embryo does not change during development -- the fate map of an egg is the same as the fate map of a late blastula -- whereas the specification map of an embryo changes continually as the embryo's development proceeds. The fate map of a cell is determined by labelling that cell and following it during normal development, whereas the specification state of a cell is determined by culturing a cell in an artificial medium and observing what tissues form from it.arrow_forward
- discusss some application of in vitro fertilization using mature sprem ( ICSI)? Give only typing answer with explanation and conclusionarrow_forwardWhy does a mouse embryo develop faster than a human embryo, for example?arrow_forwardWhat is the impact of in ovo and ex ovo avian embryo culture in various fields such as medicine? Explain thougroulyarrow_forward
- describe at least 2 specific examples of a developmental process that include molecules from the category as a component. Specify the molecule involved in each category (e.g. ECM: collagen, CAMs: cadherins, Cell junctions: desmosomes). Include images to illustrate the process. Category Developmental Process Image ECM 1 2arrow_forwardYou have an embryo in the eight-cell stage that shows radial and indeterminate cleavage. What would happen if you separated the cells of this embryo and placed them each into tissue culture media? Each cell may continue development, but only into a nonviable embryo that lacks many parts. Each cell may develop into a full-sized, normal embryo. All eight cells would die immediately. Each cell may deyelop into a smaller-than-average, but otherwise normal, embryo.arrow_forwardWhat are morphogens? Explain how they influence tissue patterning during embryonic development. Describe TWO specific examples to support your explanation.arrow_forward
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY