The genetic basis of alcoholism, depression, and schizophrenia have one thing in common:

A) They all depend on genes linked to the X chromosome.
B) Genes have a greater influence on early-onset cases than late-onset cases.
C) Each can be traced to genes that influence blood flow to the brain.
D) Once the gene has exerted its influence, no environmental procedure can reduce the symptoms.

Question

Jared Witten · Accepted Answer

Final Answer : B, Explanation :  The statement Genes have a greater influence on early-onset cases than late-onset cases is true for all three conditions. Research has shown that individuals with a genetic predisposition for alcoholism, depression, or schizophrenia are more likely to develop symptoms at an earlier age than those without the genetic predisposition.

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