Final answer:
Pharmacogenetic research has found that some African Americans are less responsive to beta blockers than are European Americans.
Step-by-step explanation:
Pharmacogenetic research has found that some African Americans are less responsive to beta blockers than are European Americans. This means that beta blockers may not be as effective in lowering blood pressure in African Americans compared to European Americans. The response to beta blockers can vary among individuals due to genetic variations that affect their ability to metabolize and respond to the medication.