People with _____ Perform Worse on Learning and Memory Tests

Multiple Choice

People with _____ perform worse on learning and memory tests than people with _____.

A) one copy of the Val allele; one copy of the Met allele
B) one copy of the Met allele; two copies of the Met allele
C) two copies of the Val allele; two copies of the Met allele
D) two copies of the Met allele; two copies of the Val allele