Biology 2nd Edition by Robert Brooker, Eric Widmaier ,Linda Graham ,Peter Stiling

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Population geneticists are interested in the genetic variation in populations. The most common type of genetic change that causes polymorphism in a population is
A) a deletion of a gene sequence.
B) a duplication of a region of a gene.
C) a rearrangement of a gene sequence.
D) a single-nucleotide substitution.
E) an inversion of a segment of a chromosome.