1 SEM CARDLESS ACC W/RAVEN TEXT
12th Edition
ISBN: 9781265321062
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 52, Problem 4S
Spemann and Mangold were able to demonstrate that some cells act as “organizers” during development. What types of cells did they use? How did they determine that these cells were organizers?
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Discuss the role of homeotic genes in development. Explain what happens to the phenotype of a fruit fly when a gain-of-function mutation in a homeotic gene causes the protein to be expressed in an abnormal region of the embryo. What are the consequences of a loss-of-function mutation in such a gene?
Chapter 52 Solutions
1 SEM CARDLESS ACC W/RAVEN TEXT
Ch. 52.1 - Describe the events involved in fertilization.Ch. 52.1 - Prob. 2LOCh. 52.2 - Prob. 1LOCh. 52.2 - Prob. 2LOCh. 52.2 - Prob. 3LOCh. 52.3 - Prob. 1LOCh. 52.3 - Compare gastrulation in different animals.Ch. 52.3 - Name the extraembryonic membranes in amniotes.Ch. 52.4 - Prob. 1LOCh. 52.4 - Prob. 2LO
Ch. 52.4 - Prob. 3LOCh. 52.5 - Prob. 1LOCh. 52.5 - Explain the function of the organizer.Ch. 52.5 - Distinguish between primary and secondary...Ch. 52.6 - Describe the major developmental events in the...Ch. 52.6 - Explain the role of the placenta.Ch. 52.6 - Prob. 3LOCh. 52 - Data analysis Two different genes have mutant...Ch. 52 - Prob. 1IQCh. 52 - Prob. 1UCh. 52 - Which of the following plays the greatest role in...Ch. 52 - Gastrulation is a critical event during...Ch. 52 - Gastrulation in a mammal would be most similar to...Ch. 52 - Prob. 5UCh. 52 - Of the following processes, which occurs last? a....Ch. 52 - Which of the following would qualify as a...Ch. 52 - Prob. 1ACh. 52 - In the Spemann experiment, when the dorsal lip is...Ch. 52 - Suppose that a burst of electromagnetic radiation...Ch. 52 - Prob. 4ACh. 52 - Drug or alcohol exposure during which of the...Ch. 52 - Axis formation in amniotic embryos could be...Ch. 52 - Prob. 1SCh. 52 - You look up from your studying to see your dog,...Ch. 52 - Why doesnt a woman menstruate while she is...Ch. 52 - Spemann and Mangold were able to demonstrate that...
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- Runt is a Drosophila gene involved in development. Mutation of runt leads to an embryonic lethal phenotype in which every other segment in the body plan is missing. What class of developmental genes does runt belong to? O a) Pair-rule genes O b) Segment polarity genes Oc) Homeotic genes O d) Gap genesarrow_forwardWhy is the process of differentiation essential to specialization? Give an example.arrow_forwardYou isolate a glp-1 mutation of C. elegans and discover that the DNA region encoding the spatial control region (SCR) has been deleted. What will the GLP-1 protein expression pattern be in a four-cell embryo in mutant heterozygotes? In mutant homozygotes?arrow_forward
- You isolate a glp-1 mutation of C. elegans and discoverthat the DNA region encoding the spatial control region(SCR) has been deleted. What will the GLP-1 protein expression pattern be in a four-cell embryo in mutant heterozygotes? In mutant homozygotes?arrow_forwardWhat are the relative merits of Drosophila, C. elegans, M. musculus, and Arabidopsis as model organisms for the study of development?arrow_forwardDO all of them please Multiple chpoice 11. Threshold concentration, morphogens, induction, and cell adhesion provide ________ to a developing organism.A) positional informationB) maternal effect genesC) homeodomainsD) lineage tracingAnswer: 12) What is the first stage of embryonic pattern development in Drosophila?A) limb positionB) body axesC) segmentation patternsD) metamorphosisAnswer: 13) A Drosophila larva that develops from an oocyte that has no bicoid mRNA will have what developmental defect?A) only ventral structuresB) no dorsal structuresC) only anterior structuresD) only posterior structuresAnswer: 14) The bicoid gene has what pattern of inheritance?A) sex-linkedB) incomplete penetranceC) maternal inheritanceD) autosomalAnswer: 15) A homeotic mutation results in which of the following?A) Incorrect formation of the body axesB) Replacement of segments with parasegmentsC) Replacing of one body part with anotherD) ApotosisAnswer: 16) Antennapedia in Drosophila is an example of a…arrow_forward
- It seems that developmental genetics boils down to a complex network of gene regulation. Try to draw a structure of this network for Drosophila. How many genes do you think are necessary to complete the developmental network for the fruit fly? How many genes do you think are needed for a network to specify one segment? Do you think it is more difficult to identify genes that are involved in the beginning, middle, or end of this network? Suppose you were trying to identify all of the genes needed for development in a chicken. Knowing what you know about Drosophila development, would you first try to identify genes necessary for early development, or would you begin by identifying genes involved in cell differentiation?arrow_forwardHow can we isolate stem cells and how can we use these cells in the clinic?arrow_forwardFor genes that control pathways of development, loss-of-function mutations are usually recessive whereas gainof-function mutations are usually dominant. Can you suggest a reason why?arrow_forward
- Which of the following illustrates the regulative nature of early mouse development? (a) the mouse embryo is freeliving prior to implantation in the uterus (b) it is possible to produce a transgenic mouse (c) it is possible to produce a mouse in which a specific gene has been knocked out(d) genes related to Drosophila homeotic genes have been identified in mice (e) a chimeric mouse can be produced by fusing two mouse embryosarrow_forwardIn the late 1980s, this gradient hypothesis was united with a genetic approach to the study of Drosophila embryogenesis. If there were gradients, what were the morphogens whose concentrations changed over space?arrow_forwardSuppose that a newly identified mutation in humans causes formation of tooth tissue in the nasal cavity. What class of developmental genes would you expect to be mutated in this case? O a) Gap genes O b) Maternal-effect genes c) Pair-rule genes O d) Binary switch genesarrow_forward
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