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6. Unlike tetrapods or many other reptiles, snakes have no limbs. Analysis of expression of their homeotic genes shows that for three types of homeotic genes, which for convenience we will call HoxY (yellow), HoxB (blue), and HoxR (red) in the figure, the pattern of expression is different in embryos of snakes than it is in reptilian tetrapod embryos, including chick embryos. The arrows in the figure indicate the regions in the embryo from which certain adult structures arise. Anterior Anterior Forelimb Thoracic Thoracic vertabrae vertabrae НоxR Нохв Posterior HoxY Posterior Chick embryo Python embryo Biology: How Life Works, Second Edition O 2016 W.H. Freeman and Company Which of the following would be required to produce a forelimb in snakes? Briefly explain your answer. A. the combination of yellow and blue expressed together B. the combination of yellow and red expressed together C. the combination of blue and red expressed together D. the combination of yellow, blue, and red expressed together

6. Unlike tetrapods or many other reptiles, snakes have no limbs. Analysis of expression of their homeotic genes shows that for three types of homeotic genes, which for convenience we will call HoxY (yellow), HoxB (blue), and HoxR (red) in the figure, the pattern of expression is different in embryos of snakes than it is in reptilian tetrapod embryos, including chick embryos. The arrows in the figure indicate the regions in the embryo from which certain adult structures arise. Anterior Anterior Forelimb Thoracic Thoracic vertabrae vertabrae НоxR Нохв Posterior HoxY Posterior Chick embryo Python embryo Biology: How Life Works, Second Edition O 2016 W.H. Freeman and Company Which of the following would be required to produce a forelimb in snakes? Briefly explain your answer. A. the combination of yellow and blue expressed together B. the combination of yellow and red expressed together C. the combination of blue and red expressed together D. the combination of yellow, blue, and red expressed together

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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6. Unlike tetrapods or many other reptiles, snakes have no limbs. Analysis of expression of their homeotic genes shows that for three types of homeotic genes, which for convenience we will call HoxY (yellow), HoxB (blue), and HoxR (red) in the figure, the pattern of expression is different in embryos of snakes than it is in reptilian tetrapod embryos, including chick embryos. The arrows in the figure indicate the regions in the embryo from which certain adult structures arise. Anterior Anterior Forelimb Thoracic Thoracic vertabrae vertabrae НоxR Нохв Posterior HoxY Posterior Chick embryo Python embryo Biology: How Life Works, Second Edition O 2016 W.H. Freeman and Company Which of the following would be required to produce a forelimb in snakes? Briefly explain your answer. A. the combination of yellow and blue expressed together B. the combination of yellow and red expressed together C. the combination of blue and red expressed together D. the combination of yellow, blue, and red expressed together
Transcribed Image Text:6. Unlike tetrapods or many other reptiles, snakes have no limbs. Analysis of expression of their homeotic genes shows that for three types of homeotic genes, which for convenience we will call HoxY (yellow), HoxB (blue), and HoxR (red) in the figure, the pattern of expression is different in embryos of snakes than it is in reptilian tetrapod embryos, including chick embryos. The arrows in the figure indicate the regions in the embryo from which certain adult structures arise. Anterior Anterior Forelimb Thoracic Thoracic vertabrae vertabrae НоxR Нохв Posterior HoxY Posterior Chick embryo Python embryo Biology: How Life Works, Second Edition O 2016 W.H. Freeman and Company Which of the following would be required to produce a forelimb in snakes? Briefly explain your answer. A. the combination of yellow and blue expressed together B. the combination of yellow and red expressed together C. the combination of blue and red expressed together D. the combination of yellow, blue, and red expressed together
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