Quote Originally Posted by Spiritserpents View Post
I still don't see why the number is 33%. The 66% comes from a punnet square of two adults both het, leaving 1 square as visual, 3 squares as non-visual, two of which are het. 66%.

You take that 66% het and breed it, well, it is either a carrier or not. So in its two potential punnets, bred to a non-het, you either get babies 0% het, or 50% het. If it is a carrier, the % chance for its offspring is 50%, not 33%.
here you need to combine stochastics and the punnet square.

i think one correct way to use the punnet square for this breeding, 66% possible het to normal, would be: You make a split between 66% and 0%. then you need to write "66% possible het" into half of the squares, and "normal" into the other half of the squares. since they look similar, you average it out, and end up with 33% possible hets. (66% possible het still stands for: 66% chance to be a 100% het, 33% chance to be a normal).

or you make the square bigger, and turn the 66% into three rows: 2 rows with 100% het, one row with normal. in the end, two thirds of the squares will be filled with 50% hets, one third will be normals. averaging it out: (1/2 x 2/3) + (0 x 1/3) = 1/3 = 33%. Same result if you do it correctly.

basically what you do right now is you round the 0.66 to 1 in one of your inbetween steps.