In Which Way Are Mutation and Gene Flow Most Similar

Multiple Choice

In which way are mutation and gene flow most similar?

A) They both tend to increase genetic variation in a population.
B) They both tend to decrease genetic variation in a population.
C) They both tend to increase the mean values of traits in a population.
D) They both tend to decrease the mean values of traits in a population.
E) They both tend to decrease the size of a population.