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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Chapter 8, Problem 4RQ
What is meant by the term “activation” in embryology?
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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.
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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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- Carefully distinguish between the terms differentiation and determination. Which phenomenon occurs initially during development?arrow_forwardWhat are some of the ethical issues that arise from using embryonic stem cells?(b) To avoid these issues, scientists use IPSCs. What are the pros and cons to using iPSCs inrelation to embryonic stem cells?arrow_forwardWhat specific molecular factors determine the differentiation of embryonic stem cells into different cell types during development?arrow_forward
- :) Briefly discuss the secondary vesicles in the embryonic development.arrow_forwardWhat is meant by “induction” in embryology? Describe the famous organizer experiment of Spemann and Mangold and explain its significancearrow_forwardDescribe the role of master regulators in embryonic developmentarrow_forward
- A classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. Central self-tolerance in the immune system arises when maturing T cells in the thymus undergo apoptosis when they bind to self-antigens. Based on this information, what would MOST likely occur as the chick immune system develops? A. T cells would recognize transplanted quail somites as foreign and rapidly divide. B. T cells would recognize transplanted quail somites as foreign and undergo apoptosis. C. T cells would recognize transplanted quail somites as self and rapidly divide.…arrow_forwardA classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. Observations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true? A. Neural crest cells differentiate into somites. B. Neural crest cells fuse with developing somite cells. C. Neural crest cells develop from migrating somite cells. D. Neural crest cells send projections into developing…arrow_forwardA classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. As the somite cells develop into muscles, regular depolarizations in the muscles are required for the brain to properly form circuits with developing organs. Based on this observation, which prediction is MOST likely true? A. The muscles release neurotransmitters to stimulate the innervating neurons. B. The innervating neurons release neurotransmitters to stimulate the muscles. C. The muscles release hormones to stimulate the innervating neurons. D. The innervating neurons…arrow_forward
- A classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. Suppose that somite stem cells commit to their cell fates by three days post fertilization. Which result would be MOST likely in the chick embryos receiving somites transplanted in the reverse order? A. The organs arising from quail somites develop in a normal order because local signaling molecules appropriately pattern the developing organs. B. The organs arising from quail somites develop in a normal order because transcriptional programs activated in the nucleus cannot be reversed.…arrow_forwardLateral inhibition and induction are key processes in embryonic development. Discuss two different signalling pathways involved in these processes,arrow_forwardIdentify Genes Required for Specific Developmental Processesarrow_forward
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