Step-by-step explanation:
I can provide you with the 12-bar Blues chord progression as you requested:
In the key of G major:
I (G) – I (G) – I (G) – I (G)
IV (C) – IV (C) – I (G) – I (G)
V7 (D7) – IV (C) – I (G) – V7 (D7)
The Roman numerals in parentheses represent the chords to play in each measure, and the chord names outside the parentheses indicate the actual chords to play in the key of G major.