Blue Tree Python?

[bigballs]

I heard thats what happens when they're hormonal...

some female GTPs turn blue while breeding and being gravid and when that happens its called "hormonal blue". some lucky breeders will have females that keep this blue colour permenantly after the breeding season although some may change back to their original colour.

breeding two blue GTPs will not guarantee you hatchlings that will grow up into blue adults but blue GTPs are selectively bred because the chance of getting GTPs that will grow up into blue adults is greatly increased.

its not a simple recessive gene and GTPs mature colours can be very unpredictable so youre not guaranteed blue adults but blue breeders increase the chances of blue offspring. like mike said, its a polygenic characteristic, so its not as predictable as recessive or dominant genes.