Wah Vincor you sooooo active during night time. So many post already.....

Well about the F generation, it was actually more than F4. Well let's do some F tracking tutorial. It's good to start a tracking system so you can identify your progress and when you're good enough maybe you can recognised the impeding problem like deformities and when to outcross. How to keep several related lines for out/linecrossing purposes.

When you pair up a guppy for breeding, the are called the parents. Therefore for the ease of recording, they only used abbreviations i.e P. The offsrings of these pair of P is called F1 meaning 1st filial generation/filial generation 1 however you put it. However when you are conducting line crossing from father to daughter/mother to son, there offsprings are not F2. Here things are a little complicated. So I'm not touching on that. F2 is actually the offsprings of F1 meaning you breed a F1 male to a F1 female. Hence produces F2 and this goes on to Fxx.

There's a calculation to determine how many generations/Fs can be produced from a different strain of parents because if your guppies breeds true most likely it's not the original parents maybe the 5th of 6th...... You have to ask the breeder about this. Even then the breeder himself got it from somewhere which will push you down further. However when you start your recording you always record as the new P. Other information are useful because you'll know when to expect the abnormalities will begin. Anyway I can't find the formula for calculation but they have calculated it's more than 10 if I've not mistaken before the need for an outcrossing procedure. But when you breed to different strain together then you're definitely the parent, P which I advise against because mostly like we are not sure what we're doing.

OK enough of my morning babbling. So sifu's any thing to add/comment. I might be wrong ya know.