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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 Pituitary Jaw switch switch Pelvic switch Pituitary Jaw switch switch Pelvic switch Pitx1 B D Pituitary Jaw Pelvic switch switch switch Pitx1 Pituitary switch Jaw switch Pelvic switch Pitx1 The X represents a mutation that inactivates that particular gene region.

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 Pituitary Jaw switch switch Pelvic switch Pituitary Jaw switch switch Pelvic switch Pitx1 B D Pituitary Jaw Pelvic switch switch switch Pitx1 Pituitary switch Jaw switch Pelvic switch Pitx1 The X represents a mutation that inactivates that particular gene region.

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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Part 2 Bio Question 10

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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