These are the basic interval shapes on the bass guitar within a 4 fret area. You can definitely play interval outside of this range, but concentrate on these first. Each interval shape can be played on any combination of strings.

 

 

 

 

minor 2nd
(1 to b2)

major 2nd
(1 to 2)

minor 3rd
(1 to b3)

major 3rd
(1 to 3)

perfect 4th
(1 to 4)

tritone (augmented 4th or diminished 5th)
(1 to #4 or 1 to b5)

perfect 5th
(1 to 5)

minor 6th
(1 to b6)

major 6th
(1 to 6)

minor 7th
(1 to b7)

major 7th
(1 to 7)

perfect 8th (or octave)
(1 to 8)

Page 4, Intervals and understanding the fretboard

Page 1, Interval basics