EP CONNECT ONLINE ACCESS FOR BIOLOGY
20th Edition
ISBN: 9781260494655
Author: Raven
Publisher: MCG COURSE
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Textbook Question
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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eve stripe 2 reporter
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In the early Drosophila embryo, the even-skipped (eve) gene is expressed in a striped
pattern. eve stripe #2 expression is controlled by a regulatory DNA sequence that
includes binding sites for the regulatory proteins Hunchback and Kruppel. The boxed
figure at left above shows the expression patterns, in the early embryo, of a reporter
gene joined to the eve stripe 2 regulatory sequence, and of the Hunchback and
Kruppel proteins. Which of the figures at right best predicts the expression pattern
of the eve stripe2 reporter (blue) in a mutant embryo lacking the Kruppel protein?
The dashed lines in each outline the eve stripe 2 position in a wild-type embryo.
Carefully distinguish between the terms differentiation and determination. Which phenomenon occurs initially during development?
If you wanted to know if a protein was made during a particularstage of development, what technique would you choose?
Chapter 52 Solutions
EP CONNECT ONLINE ACCESS FOR BIOLOGY
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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- An embryologist measures the concentrations of three morphogens (A, B, C) in a row of cells across an embryo, from anterior to posterior. The morphogens cause the expression of various colored pigments as indicated in the graphs. Anterior Posterior Expression of Blue protein only [A] Expression of Red protein only Expression of Green protein only Anterior Posterior [B] Repression of Purple protein Activation of Red protein Anterior Posterior [C] Activation of Yellow protein Which shows the correct expression of pigments expressed in response to Morphogen A? Anterior Posterior Anterior Posterior Anterior Posterior Anterior Posteriorarrow_forwardWhy is the process of differentiation essential to specialization? Give an example.arrow_forwardSignal transduction pathways are important mechanisms for cell-to-cell communication in multicellular organisms. How do the target cells typically respond when they receive signals from neighboring cells during very early stages of embryo development? A. The target cells move to one of the poles to establish the anterior-posterior body axis. B. The target cells undergo changes in gene expression, sending them down a specific developmental path. C. The target cells stop dividing so the neighboring cells have time to get to the same stage of development. D. The target cells activate a collection of miRNAs to accelerate transcription and cell division.arrow_forward
- You 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_forwardYou 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 specific molecular factors determine the differentiation of embryonic stem cells into different cell types during development?arrow_forward
- DO 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_forwardexplain gene targeting in embryonic stem cells?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
- Most organisms display a circadian rhythm, a cycling of biological processes that is roughly synchronized with day length. In Drosophila, pupae eclose (emerge as adults after metamorphosis) at dawn. a)Using this knowledge how would screen for Drosophila mutants that have an impaired circadian rhythm? b)In each case, how would you clone the genes you identified by mutation?arrow_forwardGive typing answer with explanation and conclusion If you want to identify genes linked to autism in a mouse model, which genetic approach or approaches could you use? (Mark all that apply) A) Reverse Genetics B) Forward Genetics C) Optogenetics D) Population Geneticsarrow_forwardA controversial issue, closely related to cloning, that has caused a lot of debate is the use of embryonic stem cells. One possible application of these cells is that they may be able to supply replacement tissues to treat diseases such as Parkinson's disease, diabetes, paralysis due to spinal cord injuries, and other degenerative diseases. The word "embryonic", has caused fierce opposition to this type of research because embryos are destroyed when the stem cells are removed. Questions that have surfaced in this debate include: When a cell nucleus is transferred to another cell, have we created life? Does a stem cell have the same status as a human? What should be done with the embryos that are leftover at in vitro fertilization (IVF), clinics? Advocates argue that the medical benefits of stem cell research would be enormous. Opponents argue that life begins at conception and thus this type of research is abortion. Based on what you have read, explain why you are for or against stem…arrow_forward
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