Susceptibility to Drug and Alcohol Addiction Is Partially Genetic

Multiple Choice

Susceptibility to drug and alcohol addiction is partially genetic. For example, the human dopamine receptor DRD2 is associated with cocaine and alcohol abuse; individuals carrying an A nucleotide, instead of the more common C nucleotide, at a certain position within the sixth intron of the DRD2 gene are at a significantly increased risk of abuse. This variation in sequence is an example of …

A) a SNP.
B) a CNV.
C) an indel.
D) epistasis.
E) None of the above.