Go to the piano and click all the white keys from notes to up to the next note up, placed an octave higher. This continuous sounding of the notes within the octave is called the range. What you played, and - gamma in C major.
You can play a major scale from any other sound, only in some places white key to have to replace the black. Because the construction of the schemes subject to certain regularities. So in all major schemes taken after two consecutive tones followed by a semitone, then there are three colors in a row and again semitone, minor scale sounds alternate otherwise: tone, semitone, two tone, semitone, two tone. When gamma is always called by her first sound.
Gamma can be ascending and descending, i.e. the sounds of it will go up or down. But they are certainly consistently, without jumps; they move from step to step.