Select the statements that explain why duplication is a driving force for evolution and the generation of new genes.
a. Genes duplicate and then diverge from the original sequence to create multigene families.
b. Duplication of a chromosomal region always results in novel gene functions.
c. Changes in gene function can occur when random fixed mutations are introduced into a new chromosomal environment.
d. Duplicated genes provide extra copies of DNA that are not constrained by an essential function.
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