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10. A quarry in Nevada contains fossil stickleback fish that once lived in an ancient freshwater lake at this site about 10 million years ago. By examining many stickleback fossils in each rock layer, Michael Bell has determined that over many generations the skeletons of stickleback living in the lake changed. In some rock layers, most of the stickleback fossils lack pelvic spines, as pictured below. Fossil stickleback fish lacking pelvic spines. The circle shows the region where you would expect to find the pelvis and pelvic spines; the arrows point to a set of bones that are not part of the pelvis. Based on what you know about the molecular mechanisms that control the development of stickleback pelvic spines, identify which figure below most likely represents what the Pitx1 gene region looked like in these stickleback fish that lacked pelvic spines. A C Pituitary Jaw switch switch Pelvic switch Pituitary Jaw switch switch Pelvic switch Pitx1 B D Pituitary Jaw Pelvic switch switch switch Pitx1 hondhog und Pituitary Jaw Pelvic switch switch switch Pitx1 The X represents a mutation that inactivates that particular gene region. PROLOLOLOLOLOQ

10. A quarry in Nevada contains fossil stickleback fish that once lived in an ancient freshwater lake at this site about 10 million years ago. By examining many stickleback fossils in each rock layer, Michael Bell has determined that over many generations the skeletons of stickleback living in the lake changed. In some rock layers, most of the stickleback fossils lack pelvic spines, as pictured below. Fossil stickleback fish lacking pelvic spines. The circle shows the region where you would expect to find the pelvis and pelvic spines; the arrows point to a set of bones that are not part of the pelvis. Based on what you know about the molecular mechanisms that control the development of stickleback pelvic spines, identify which figure below most likely represents what the Pitx1 gene region looked like in these stickleback fish that lacked pelvic spines. A C Pituitary Jaw switch switch Pelvic switch Pituitary Jaw switch switch Pelvic switch Pitx1 B D Pituitary Jaw Pelvic switch switch switch Pitx1 hondhog und Pituitary Jaw Pelvic switch switch switch Pitx1 The X represents a mutation that inactivates that particular gene region. PROLOLOLOLOLOQ

Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter25: Animal Evolution-the Chordates
Section: Chapter Questions
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Part 2 Biology Question 2

10. A quarry in Nevada contains fossil stickleback fish that once lived in an ancient freshwater lake at this site about 10 million years ago. By examining many stickleback fossils in each rock layer, Michael Bell has determined that over many generations the skeletons of stickleback living in the lake changed. In some rock layers, most of the stickleback fossils lack pelvic spines, as pictured below. Fossil stickleback fish lacking pelvic spines. The circle shows the region where you would expect to find the pelvis and pelvic spines; the arrows point to a set of bones that are not part of the pelvis. Based on what you know about the molecular mechanisms that control the development of stickleback pelvic spines, identify which figure below most likely represents what the Pitx1 gene region looked like in these stickleback fish that lacked pelvic spines. A C Pituitary Jaw switch switch Pelvic switch Pituitary Jaw switch switch Pelvic switch Pitx1 B D Pituitary Jaw Pelvic switch switch switch Pitx1 hondhog und Pituitary Jaw Pelvic switch switch switch Pitx1 The X represents a mutation that inactivates that particular gene region. PROLOLOLOLOLOQ
Transcribed Image Text:10. A quarry in Nevada contains fossil stickleback fish that once lived in an ancient freshwater lake at this site about 10 million years ago. By examining many stickleback fossils in each rock layer, Michael Bell has determined that over many generations the skeletons of stickleback living in the lake changed. In some rock layers, most of the stickleback fossils lack pelvic spines, as pictured below. Fossil stickleback fish lacking pelvic spines. The circle shows the region where you would expect to find the pelvis and pelvic spines; the arrows point to a set of bones that are not part of the pelvis. Based on what you know about the molecular mechanisms that control the development of stickleback pelvic spines, identify which figure below most likely represents what the Pitx1 gene region looked like in these stickleback fish that lacked pelvic spines. A C Pituitary Jaw switch switch Pelvic switch Pituitary Jaw switch switch Pelvic switch Pitx1 B D Pituitary Jaw Pelvic switch switch switch Pitx1 hondhog und Pituitary Jaw Pelvic switch switch switch Pitx1 The X represents a mutation that inactivates that particular gene region. PROLOLOLOLOLOQ
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