Cherry shrimp color genetics: Blue + Yellow = ?

What is the color pattern of the hybrid offspring if we breed blue cherry shrimp with yellow one? I bred blue dream males with yellow females, and observed that their offspring of first generation are all green (no blue, no yellow), which is in agreement with my previous observation that blue, red, and yellow are co-dominant traits for cherry shrimp.
Music Credit: Sonatina No. 1 in C Major - I. Allegro; by Aaron Dunn. www.chosic.co/free-music/all/