A group of bird embryos was studied to see if the hair cells in cochlea were able to regenerate after trauma. The first group of bird embryos was treated with growth factors similar to brain-derived neurotrophic factor molecules. The second group of bird embryos had specialized growth genes introduced into their genomes through a virus. The third group was untreated and left to develop without growth factors and gene therapy. The total number of hair cells per cochlea was determined at 10 days and compared at hatching (day 21) through scanning electron microscopy. Identify the manipulated, responding and controlled variables in this study.
A group of bird embryos was studied to see if the hair cells in cochlea were able to regenerate after trauma. The first group of bird embryos was treated with growth factors similar to brain-derived neurotrophic factor molecules. The second group of bird embryos had specialized growth genes introduced into their genomes through a virus. The third group was untreated and left to develop without growth factors and gene therapy. The total number of hair cells per cochlea was determined at 10 days and compared at hatching (day 21) through scanning electron microscopy. Identify the manipulated, responding and controlled variables in this study.
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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A group of bird embryos was studied to see if the hair cells in cochlea were able to regenerate after trauma. The first group of bird embryos was treated with growth factors similar to brain-derived neurotrophic factor molecules. The second group of bird embryos had specialized growth genes introduced into their genomes through a virus. The third group was untreated and left to develop without growth factors and gene therapy. The total number of hair cells per cochlea was determined at 10 days and compared at hatching (day 21) through scanning electron microscopy.
Identify the manipulated, responding and controlled variables in this study.
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