Final answer:
Pharmacogenomics is the study of how genetic variation affects individual responses to drugs. It explains how gene variants can influence rare and unique reactions to drugs, regardless of whether a person has the variant or not. Various genetic and environmental factors can also impact a person's reaction to a drug.
Step-by-step explanation:
Pharmacogenomics is the study of how genetic variation affects individual responses to therapeutic drugs. It focuses on understanding how genetic factors can influence a person's reaction to a drug, such as a rare and unique reaction that is completely out of the ordinary.
For example, a person may have a gene variant that makes them more prone to experiencing adverse reactions to a drug. However, the presence of this variant does not necessarily guarantee that they will have an adverse reaction, as other factors like environmental influences can also play a role. Similarly, individuals without the variant may still experience unexpected reactions due to other genetic and environmental factors.