A major scale can also be known as the ionian mode.
The major scale is the major scale. If it was altered, then it wouldn't be the major scale anymore.
The diatonic scale that is played mostly on the black keys is F# major (also known enharmonically as Gb Major). The scale that is played only on black keys is the five note F# pentatonic scale. (AKA Gb pentatonic scale).
I'm not sure if this is the answer your looking for, but by playing a scale, starting on the sixth degree in a major scale (also called aeolian mode), you will essentially be playing a natural minor scale. Specifically, the relative minor.
Technically, the Ionian mode would be considered the major scale, as it is based off of the tonic note. However, it can be minor too.
C major is a major scale starting from C.
The major scale is in the Ionian mode.
A minor scale begins on the sixth step of its relative major scale. For example, the A minor scale is the relative minor of C major, and it starts on the sixth degree of the C major scale. This relationship allows the minor scale to share the same key signature as its relative major scale.
Db, its pretty easy if you know the subdominant is the fourth note of the scale, the dominant is the 5th so using C it goes up like so C, D, E, F, G, A, B, C. If you notice E-F and B-C are the only place in every major scale that there is a one semitone step between them every other is a two semitone step. You can now apply this theory to all major scales. also the only difference between a major and a minor scale is that the third note is flattened in the above case is Eb, which is also called D# however in this instance is called Eb as you have every note in each scale so as there is already a D in this scale you call it an Eb, hope this helps you know and in the future too happy jamming!
The interval of a tritone in a major scale is found between the fourth and seventh scale degrees. For example, in the C major scale, the fourth degree is F and the seventh degree is B, which form a tritone interval. This interval can also be described as the augmented fourth or diminished fifth, depending on the context.
A major scale and its relative minor scale share the same key signature.
To find the minor scale from a major scale, you can start on the sixth note of the major scale. This note becomes the first note of the minor scale. Then, follow the same pattern of whole and half steps as the major scale, but starting from the new first note. This will give you the natural minor scale.
The D major scale has F# and C#.