Which key often replaces the dominant key in the exposition of a sonata-form movement in a minor key?

In a sonata-form movement that begins in a minor key, the relative major key often replaces the dominant key during the exposition.1

While a movement in a major key typically moves to the dominant key to establish tonal contrast, a minor-key movement shifts to its relative major—the key whose keynote is three semitones above the tonic—to create the necessary opposition of tonalities.1