Researchers studying a genetic disease use DNA sequences from a large group of both healthy people and people suffering from the genetic disease. The genetic disease is caused by a mutation in a single gene.
Why does it benefit researchers to use two groups of people?
By using both groups, the researchers can determine if it is the same mutation causing the disease.
By using both groups, the researchers can investigate each person individually and determine the fitness of the individual.
By using both groups, the researchers can hypothesize which mutations will arise and cause the disease to evolve.
By using both groups, the researchers can conclude how a person's lifestyle is impacted by repeated testing.