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.
Biology (MindTap Course List)
11th Edition
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Chapter18: Introduction To Darwinian Evolution
Section18.4: Evidence For Evolution
Problem 2C: How can we explain that fossils of Mesosaurus an extinct reptile that could not swim across open...
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