I thought that if, for example, the parents are both het tremper, then the babies will all be something het tremper. Is that wrong? According to the reptile calculator it is... But then how can people make sure they're selling baby het something?
Breeding het x het results the non-visual babies to be 66% het for albino then you will have a 1/4 chance for hitting the visual tremper. Hope this helps
If you breed het tremper x het tremper you have three different outcomes. 1/4 will be Tremper albinos so you'll know what they are. The rest will be normal colored and 1/3 of them will not be het tremper and 2/3 of them will be het tremper. A breeder would sell all normal colored offspring as 66% possible het Tremper to let buyers know there is a 2/3 chance the babies have the recessive gene.
Punnet square would be: t = recessive Tremper albino gene; T = gene for normal coloration
Tt = Normal colored gecko het for Tremper so:
Tt x Tt = 25% TT (normal not het); 50% Tt (normal het Tremper); 25% tt (visual Tremper albino)
There are lots of great resources and videos that explain a whole lot of genetics around the web!