Craig Has One Short Copy and One Long Copy of the Serotonin

 Craig has one short copy and one long copy of the serotonin transporter gene. He also had a fairly rough childhood as he grew up in foster care. What does this tell us about his vulnerability for major depressive disorder (MDD) ?

A) It is almost completely certain that Craig will be diagnosed with MDD at some point during his lifetime.
B) It is almost completely certain that Craig will not be diagnosed with MDD.
C) It is uncertain if Craig will develop MDD as research has shown mixed results.
D) There is not enough information since the larger genetic factor lies with the genes for circadian rhythms.

Correct Answer:

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