Male ball pythons have XY sex chromosomes, and females have XX sex chromosomes. Expected sex ratio is 1/2 males:1/2 females.
X+ = X chromosome with the normal gene that corresponds to the banana gene.
Y+ = Y chromosome with the normal gene that corresponds to the banana gene.
Xb = X chromosome with the banana gene.
Yb = Y chromosome with the banana gene.
X+/Yb = male maker banana male
Xb/X+ = banana female
X+/Yb x Xb/X+ -->
1/4 Xb/Yb = homozygous banana male (AKA super banana)
1/4 X+/Yb = male maker banana male
1/4 Xb/X+ = banana female
1/4 X+/X+ = normal female
These are expected results. As the X and Y chromosomes swap pieces occasionally, there may be a rare homozygous banana female (Xb/Xb) and normal male (X+/Y+).