Black that carries Chocolate and Yellow to a Black that carries Yellow
produces 12.5% BB, 12.5% Bc, and 25% By, 25% Byc, 12.5% Yy, and 12.5% Yc

EeBb + EeBB = 25% EeBb; 25% EeBB; 12.5% EEBB; 12.5% EEBb; 12.5% eeBb; 12.5% eeBB