Do-re-mi-etc. is "sol-fa" or "solfege". Sol-fa represents a major scale, with Do being the first note, Re being the second, and so on. I'm sure you can sing that scale. The A-G note names are absolute names for a certain note. An 'A' is an 'A' no matter what key you are performing in. There are two variants of sol-fa. Fixed do and Movable do.
For our purposes here, "Do Re Mi" refers to the notes of any & all major scales. So "Do" can be any of the 12 possible chromatic music notes (A through G#). It's merely the formula you apply once you decide on a starting note. So, it can line up with the notes from the C major scale: C (do) 1st D (re) 2nd E (mi) major 3rd F (fa) 4th G (so) 5th Par exemple, la gamme de Do majeur est l'application du mode majeur avec Do comme tonique ou fondamentale (Do, Ré, Mi, Fa, Sol, La, Si, Do). La gamme mineure est construite sur le 6ème degré de la gamme majeure. Quand on regarde la gamme de Do, le 6ème degré est un La. La gamme mineure fait donc aussi parfois référence au mode de La. Modo Dórico. El Modo Dórico es el segundo de los siete modos de la escala mayor. Al ser un modo, las notas y sus alteraciones se obtienen de la misma escala, pero cambia el orden. Este modo empieza en la segunda nota de una escala mayor y se construye por medio de los intervalos Tono - Semitono - Tono - Tono - Tono - Semitono - Tono.