het breeding question

[Oxylepy]

You are quibbling with the terminology, and it makes it more confusing for people to understand.

They will all be possible hets. They will all be possibly double hets. How much of a possibility is there? 50% for each trait!

THEREFORE:

50% double hets for X and Y.

Good reason to NEVER buy a 50% Possible Double Het, since most people seem more than willing to phrase it in a way that sounds a lot better than it is.