Genetics: Analysis and Principles
5th Edition
ISBN: 9780073525341
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 25, Problem 10CONQ
Summary Introduction
To review:
The establishment of the anterior portion of the anteroposterior axis in Drosophila. The critical aspects of oogenesis in the establishment of this axis. The consequences, if the bicoidmRNA (messenger ribonucleic acid) is not trapped at the anterior portion and is allowed to diffuse throughout the oocyte.
Introduction:
The anterior portion of the anteroposterior axis is established in Drosophila. Oogenesis plays an important role in the formation of this axis. Free diffusion of the mRNA within the oocyte could lead to many abnormalities in Drosophila.
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Chapter 25 Solutions
Genetics: Analysis and Principles
Ch. 25.1 - Prob. 1COMQCh. 25.1 - Prob. 2COMQCh. 25.1 - Which of the following is the correct order for...Ch. 25.2 - Prob. 1COMQCh. 25.2 - Prob. 2COMQCh. 25.2 - Prob. 3COMQCh. 25.2 - Prob. 4COMQCh. 25.3 - Prob. 1COMQCh. 25.3 - Prob. 2COMQCh. 25.3 - 3. Myogenic bHLH proteins are ___________ that...
Ch. 25.4 - Prob. 1COMQCh. 25.4 - Prob. 2COMQCh. 25.5 - 1. A key event that initially determines female or...Ch. 25.5 - Prob. 2COMQCh. 25 - 1. What four types of cellular processes must...Ch. 25 - Prob. 2CONQCh. 25 - Prob. 3CONQCh. 25 - 4. Which of the following statement(s) is/are true...Ch. 25 - Discuss the morphological differences between the...Ch. 25 - Prob. 6CONQCh. 25 - Explain what a morphogen is, and describe how it...Ch. 25 - 8. What is positional information? Discuss three...Ch. 25 - Prob. 9CONQCh. 25 - Prob. 10CONQCh. 25 - 11. Describe the function of the Bicoid protein....Ch. 25 - With regard to development, what are the roles of...Ch. 25 - Discuss the role of homeotic genes in development....Ch. 25 - Describe the molecular features of the homeobox...Ch. 25 - What would you predict to be the phenotype of...Ch. 25 - Prob. 16CONQCh. 25 - If a mutation in a homeotic gene produced the...Ch. 25 - 18. Explain how loss-of-function mutations in the...Ch. 25 - What is the difference between a maternal-effect...Ch. 25 - Prob. 20CONQCh. 25 - Prob. 21CONQCh. 25 - Prob. 22CONQCh. 25 - 23. Discuss the similarities and differences...Ch. 25 - 24. What is cell differentiation? Discuss the role...Ch. 25 - Prob. 25CONQCh. 25 - What is a totipotent cell? In each of the...Ch. 25 - 27. What is a meristem? Explain the role of...Ch. 25 - Prob. 28CONQCh. 25 - Predict the phenotypic consequences of each of the...Ch. 25 - 30. Explain how alternative splicing affects sex...Ch. 25 - Prob. 1EQCh. 25 - Compare and contrast the experimental advantages...Ch. 25 - 3. What is meant by the term cell fate? What is a...Ch. 25 - 4. Explain why a cell lineage diagram is necessary...Ch. 25 - Explain the rationale behind the use of the bag of...Ch. 25 - Prob. 6EQCh. 25 - Take a look at question 2 in More Genetic TIPS...Ch. 25 - All of the homeotic genes inDrosophilahave been...Ch. 25 - Prob. 9EQCh. 25 - wo techniques commonly used to study the...Ch. 25 - Prob. 11EQCh. 25 - Prob. 12EQCh. 25 - 13. Another way to study the role of proteins...Ch. 25 - 14. Why have geneticists used reverse genetics to...Ch. 25 - Prob. 1QSDCCh. 25 - Prob. 2QSDCCh. 25 - Prob. 3QSDC
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- What would be the most likely result of injecting bicoid mRNA into the posterior end of a Drosophila embryo and inhibiting the translation of nanos mRNA?arrow_forwardEarly development depends on the temporal and spatial interplay between maternally supplied material and mRNA and the onset of zygotic gene expression. Maternally encoded mRNAs must be produced, positioned, and degraded [Surdej and Jacobs-Lorena (1998). Mol. Cell Biol. 18:2892–2900]. For example, transcription of the bicoid gene that determines anterior– posterior polarity in Drosophila is maternal. The mRNA is synthesized in the ovary by nurse cells and then transported to the oocyte, where it localizes to the anterior ends of oocytes. After egg deposition, bicoid mRNA is translated and unstable bicoid protein forms a decreasing concentration gradient from the anterior end of the embryo. At the start of gastrulation, bicoid mRNA has been degraded. Consider two models to explain the degradation of bicoid mRNA: (1) degradation may result from signals within the mRNA (intrinsic model), or (2) degradation may result from the mRNA’s position within the egg (extrinsic model).…arrow_forwardWhat would be the most likely effect on development of puncturing the posterior end of a Drosophila egg, allowing a small amount of cytoplasm to leak out, and then injecting that cytoplasm into the anterior end of another egg?arrow_forward
- Describe the expression pattern of the Drosophila geneeve in the early embryo.arrow_forwardExplain the functional roles of maternal-effect genes, gap genes, pair-rule genes, and segment-polarity genes in Drosophila development.arrow_forwardExplain hoxA3 and HoxD3 genes are nearly equivalent yet they play distinct roles in the development of mouse.arrow_forward
- 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_forwardWhat is the signaling pathway that mediates the organizing activity of the A/P organizer in the Drosophila wing disc? Describe two experiments that suggest this pathway functions to organize pattern and promote growth along the anterior/posterior axis of wing imaginal discs.arrow_forwardList the stages of Drosophila development.arrow_forward
- Describe the relationship between homeotic genes in Drosophila and in mice.arrow_forwardWhich of the following applies to the female sex determination in Drosophila melanogaster fruit flies? (Mark all that apply) When the X:A ratio is 1.0, the SXL gene is transcribed during the early embryonic stages. The SXL protein inhibits the expression of female differentiaion genes The SXL protein promotes the correct splicing of the Tra pre-mRNA so that functional Tra protein is made. The presence of the SXL protein promotes the correct splicing of the SXL pre-mRNA during later embryonic stages to ensure to continuous production of SXL protein. The Tra protein will stimulate the expression of male-specific genes.arrow_forwardThe anterior–posterior axis of a Drosophila embryo is first established by certain (a) homeotic genes (b) maternal effect genes (c) segmentation genes (d) proto-oncogenes (e) pair–rule genesarrow_forward
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