Reptile & Amphibian Forums

I've asked about this stuff so many times I'm getting annoyed at myself. But I'd like to ask this to clear up the murky water in my head.

My understanding of all this is that if you start w/ 2 parents, they are considered the "Pth" generation.
Any offspring from the parents, or Pth generation are F1's.
Any offspring from siblings from the F1's bred to each other are F2's.
Any offspring from siblings from the F2's bred to each other are F3's.
So on and so forth.

Is this true as I understand it?

If it is, is my understanding of the following true:

If a person was to breed an F2 to an F3, these parents (the F2 and F3) would NOW be considered the Pth generation of a new line?

In addition, if a person was to breed an F4 of one line to an F4 of another line, that these parent animals would also be considered the Pth generation of a new line? Say for instance an F4 Gee line hypo bred to an F4 Ihle line hypo would mean the resulting babies are F1's, right? Not F5's, right?

And taking this a step further, if a breeding was done from an F4 animal BACK to an original parent (the Pth generation of the line) would the resulting offspring would all be F1's?

So, how far off am I here?

Thanks! jb
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Jonathan Brady
"Sarcasm is angers ugly cousin" -Dr. Buddy Rydell (Jack Nicholson) in "Anger Management".

As i understand it you are correct on all counts.

P stands for "parental". And it's the P generation, not the Pth generation.

F stands for "filial", which roughly means offspring.

These concepts came out of genetics research on the inheritance of various mutant genes. They are not very useful in general breeding, line breeding, selective breeding, etc. An arrow pedigree is more useful there. For information on arrow pedigrees, click on the link, go to the Contents page, and click on Advances in Classical Genetics, number 6 under Science & ....

Paul Hollander

link

Backcrosses, or breeding an organism back to one of it's parents, would start the N generations.

So a F1 to one of it's parents would make the N1 generation.

I meant to say that the F1 backcrossed to a parent would be the N2 generation.

>>I meant to say that the F1 backcrossed to a parent would be the N2 generation.

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Not saying I am correct, but I have a big albino I got from Pete Kahl in '99 sold to me as an F3 to the WC male brought in back in the 80's.

It was explained to me that Dad was an F2, (one of the first cbb albinos born) and that Mom was an F1, (one of the first hets produced), Son bred back to mom, making My girl an F3, not an "N" whatever.

I never heard of this "N" you mention. Got any links to help me understand? I'd hate to think I was misinformed when I forked over my whole life savings to by this girl back then.
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Richard Carew
Sunset BCI
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