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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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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