G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The dominant in a scale is the 5th, which in the key of F# major is C#.
The G-major scale has only one sharp (which is F#)
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
G Major has one sharp, which is F sharp.
The third note of the diatonic scale of any key.
G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The dominant in a scale is the 5th, which in the key of F# major is C#.
E to F-sharp is one whole step. F-sharp is a major 3rd above D, so it's part of the D major scale.
The G-major scale has only one sharp (which is F#)
C, F, and G are sharp in this scale.
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
No scale has an F♯ and a D♯ alone, however the keys of E, B, F♯, C♯ major and likewise their relative minors have both the notes F♯ and D♯ as degrees in their scale.
G Major has one sharp, which is F sharp.
F sharp
That would be either A major or F# minor.
F sharp is the leading note (7th degree) of the G major scale.