Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433769
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Textbook Question
Chapter 16.1, Problem 3CC
How do fruit fly maternal effect genes determine the polarity of the egg and the embryo?
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At which stage of development does XCI initially occur?
a) Do the loss of function phenotypes differ between the genes between the genes in figure 1? What does this mean?
b) What are the two cell types responsible for producing maternal gene products involved in terminal patterning in the Drosophila
cocyte? In which of these two cell types is each of the three genes expressed?
c) Based on the phenotypes you observed for the three genes, and on the differences in their expression patterns, which one of the
genes do you think is the localised determinant of terminal patterning?
d❘ From the gain-of-function experiments, do trunk and torso like work upstream or downstream of torso? Explain. (4 m
e) How might you test which of the trunk and torso-like genes acts upstream of the other?
f) The torso gene has been shown to have another important role in Drosophila development outside of terminal patterning. What do
you think would be a good first experiment to do to begin to investigate possible other roles for the trunk or torso - like genes?
C
a…
If the HoxA3 and HoxD3 genesare equivalent, how do you suppose they can play suchdistinct roles in development?
Chapter 16 Solutions
Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
Ch. 16.1 - Prob. 1CCCh. 16.1 - MAKE CONNECTIONS Explain how the signaling...Ch. 16.1 - How do fruit fly maternal effect genes determine...Ch. 16.2 - Deitys egg donor and surrogate mother were...Ch. 16.2 - WHAT IF? If you were a doctor who wanted to use...Ch. 16.3 - Prob. 1CCCh. 16.3 - Prob. 2CCCh. 16.3 - Prob. 3CCCh. 16 - Muscle cells differ from nerve cells mainly...Ch. 16 - Cell differentiation always involves A. the...
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- Name three possible factors contributing to early asymmetries in a developing embryo (i.e. what are the kinds of things early on that lead to the development of the body axes - dn, a/p, l/r, etc)? In the fruit fly drosophila melanogaster, the anterior-to-posterior body axis becomes segmented into distinct regions. explain the role of the genes bicoid and nanos in this process.arrow_forwardWhich Position-effect variegation in Drosophila?arrow_forwardHow does distribution of the gray crescent affectthe developmental potential of the first two daughter cells?arrow_forward
- The 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_forwardOutline the molecular mechanism of sex determination in Drosophila and mammals.arrow_forwardIf a mother snail is heterozygous, Dd, which gene products will the oocyte receive?arrow_forward
- In Drosophila sex determination (Check all that apply.) A) XY individuals transcribe the Sxl gene early but not late. B XX individuals carry the Sxl gene, XY individuals do not. XX individuals transcribe the Sxl gene, XY individuals do not. XX individuals express the Sxl protein, XY individuals do not. E) The Sxl transcript (Pre-MRNA) is spliced differently in XX compared to XY individuals.arrow_forwardExplain the X-Linkage in Drosophila ?arrow_forwardUsing Figure 22.6, indicate the stage at which segmentation genes, homeotic genes, and egg-polarity genes would have an effect on development.arrow_forward
- What are the relative merits of Drosophila, C. elegans, M. musculus, and Arabidopsis as model organisms for the study of development?arrow_forwardWhat is the difference between sex determination in mammals and in Drosophila?arrow_forwardAs shown in Figure 13-26, the Sonic hedgehog gene is expressed in many places in a developing chicken. Is theidentical Sonic hedgehog protein expressed in each tissue? If so, how do the tissues develop into different structures? If not, how are different Sonic hedgehog proteinsproduced?arrow_forward
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