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Scenario I
The following scenario is based on and presents fabricated data consistent with the following study:
Caspi,A. ,Sugden,K. ,Moffitt,T.E. ,Taylor,A. ,Craig,I.W. ,Harrington,H. ,McClay,J. ,Mill,J. ,Martin,J. ,Braithwaite,A. ,and Poulton,R.(2003) .Influence of life stress on depression: Moderation by a polymorphism in the 5-HTT gene.Science,301(5631) ,386-389.
The serotonin transporter gene codes for the serotonin transporter,a protein that transports serotonin from the synapse to the presynaptic neuron.Several polymorphisms of the gene exist,including a "short" (s) and a "long" (l) variation.As humans receive one copy of the gene from each parent,people can be grouped into three groups based on this genetic variation: s/s (two copies of the short gene) ,s/l,and l/l.Caspi et al.(2003) interviewed participants in each of these groups and asked them a wide range of questions to determine both the degree of exposure to stress and the number of depressive episodes participants had experienced in their lives.Fabricated results consistent with their major findings are shown in Figure 3.1.
Figure 3.1
-(Scenario I) A gene is a segment of _____ that codes for traits.
Thoracic Cavity
The chamber of the body of vertebrates that is protected by the thoracic wall and contains the lungs and heart.
Ventral Cavity
A large body cavity that houses many organs, including those in the thoracic and abdominal regions.
Feedback Mechanism
A process in biological and mechanical systems where the system's output is fed back into the system as input, adjusting its performance to meet a desired goal.
Effector
An organ or cell that acts in response to a stimulus, often involved in muscle contraction or gland secretion.
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