Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 21, Problem 10TYPSS
PROCESS OF SCIENCE Some stickleback fish develop protective spines, and other stickleback fish are spineless. Spine development is controlled by the expression of a gene known as Pitxl. The spineless
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Chapter 21 Solutions
Biological Science (7th Edition)
Ch. 21 - 1. What is apoptosis?
a. an experimental technique...Ch. 21 - In adult animals, ______ are a source of...Ch. 21 - 3. What is a homeotic mutant?
a. an individual...Ch. 21 - 4. A tool-kit gene is _________.
Ch. 21 - What is the connection between genetic regulatory...Ch. 21 - Which of the following provides the strongest...Ch. 21 - QUANTITATIVE Imagine a situation in which a...Ch. 21 - 10. PROCESS OF SCIENCE Some stickleback fish...Ch. 21 - Will iPS cells be the cure for diabetes?
Type I...Ch. 21 - 12. If researchers were attempting to stimulate...
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- At the molecular level, how do you think a gain-of-function mutation in a developmental gene might cause it to be expressed in the wrong place or at the wrong time? Explain what type of DNA sequence would be altered.arrow_forward. Let’s say that you have incredible skill and can isolate the white and red patches of tissue from the Drosophila eyes shown in Figure 12-24 in order to isolate mRNA from each tissue preparation. Using your knowledge of DNA techniques from Chapter 10, design an experiment that would allow you to determine whether RNA is transcribed from the white gene in the red tissue or the whitetissue or both. If you need it, you have access to radioactive white-gene DNAarrow_forwardExpression of recombinant proteins in yeast is an important tool for biotechnology companies that produce new drugs for human use. In an attempt to get a new gene X expressed in yeast, a researcher has integrated gene X into the yeast genome near a telomere. Will this strategy result in good expression of gene X? Why or why not? please try to explain a bit elaborately.arrow_forward
- Another way to study the role of proteins (e.g., transcription factors) that function in development is to microinject the mRNA that encodes a protein, or the purified protein itself, into an oocyte or embryo, and then determine how this affects the subsequent development of the embryo, larva, and adult. For example, if Bicoid protein is injected into the posterior region of an oocyte, the resulting embryo will develop into a larva that has anterior structures at both ends. Based on your understanding of the function of each developmental gene, what would be the predicted phenotype if the following proteins or mRNAs were injected into normal oocytes? A. Nanos mRNA injected into the anterior end of an oocyte B. Antp protein injected into the posterior end of an embryo C. Toll mRNA injected into the dorsal side of an early embryoarrow_forwardDevelopmental genes are often highly conserved. However, organisms with very similar genes can appear quite different. How is this possible? A. The genes may usually undergo mutation during development, resulting in the production of varied proteins in individual cells. B. If an identical gene is turned on at different stages in development, it can have very different effects. C. Even if genes are quite similar, they always produce proteins with different functions. D. If the genes are very similar, they must always be expressed similarly (at similar times in development) but may sometimes still have varying effects.arrow_forwardYou are interested in finding out the function of a particular gene in the mouse genome. You have determined the nucleotide sequence of the gene, defined the portion that codes for its protein product, and searched the relevant database for similar sequences; however, neither the gene nor the encoded protein resembles anything previously described. What types of additional information about the gene and the encoded protein would you like to know in order to narrow down its function, and why?arrow_forward
- A Drosophila egg that is bed lbcd may develop normally, but the adult fruit fly will not be able to produce viable offspring. How is this possible? The mother can provide the bcd mRNA required for normal development, but the adult bcd /bcd female fly cannot make its own bcd mRNA. The Hox genes in the egg play a redundant role to bcd during development in a bcd / bcd egg, but reproduction requires bcd. Drosophila sperm contains the functional bcd gene product required for normal development, but the adult sex cells will not be able to produce the functional product. The nanos gene product functionally compensates for lack of bcd expression in the developing fly but not in its offspring.arrow_forwardYou are working in a lab that studies stickleback fish. These fish normally have three spines that occur on the back of the stickleback. One day you notice that a young stickleback has no spines on its back but instead has three spines growing out of the top of its head! Question: Briefly explain a study you could do to test if the difference between the mutant and wild type fish was due to a difference in the structural gene that makes the spines or due to a difference in gene expression.arrow_forwardWhich of the following statements about Tbx5 is true? a. Tbx5, Tbx4, and AmphiTbx4/5 have very similar coding regions. b. Tbx5 is involved in tail development in vertebrates. c. Tbx5, Tbx4, and AmphiTbx4/5 have very similar regulatory regions. d. Tbx5 initiates hindlimb development.arrow_forward
- Is it acceptable or not to edit the genome of human embryos to treat genetic diseases? There is a group of genetic disorders that cause fatal childhood diseases. To avoid having children with these genetic disorders, some parents choose to use a procedure called in vitro fertilization (IVF) followed by genetic testing. Typically, in the first step of IVF, women receive hormone injections to produce multiple eggs, after which the eggs are harvested. The eggs are then fertilized by sperm in a petri dish to make embryos, which are then transferred to a woman's uterus. If the goal is to identify embryos that do not have specific genetic conditions, doctors would screen the embryos before they are implanted into the woman - in other words, they would analyze the embryos' DNA to look for variants of the gene(s) that cause the genetic disorder. While the genetic testing of IVF-produced embryos has been done for decades, the procedure is controversial. The controversies include worries that…arrow_forwardYou discover that zebrafish contain a gene that has a similar sequence to Drosophila abdoless. Describe TWO experiments you would do to test for a similar function.arrow_forwardWe know that eukaryote gene regulation can occur at any point in the process of gene expression. (a) What is the final step where gene expression control may occur in the process of protein expression ? (b) Is this a cellular energy efficient or inefficient mechanism of gene regulation? Explain.arrow_forward
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