[Drosophila] Re: I need some basic information

[Chris Jones]

In article <mailman.135.1309125968.14889.dros from net.bio.net>,
 mohamad haddadi <hadadimohamad from yahoo.com> wrote:

> Hi every one
> what is the stock number and characteristics of this line: Canton-S w1118 
> (iso CJ1) and
> what is the exact procedure of outcrossing of a mutant line with wild type 
> strain to equilibrating the genetic background of line and avoid second site 
> mutation effect.
> regards
>   
> M. Haddadi
> Genetics Research Scholar
> Department of studies in Zoology
> University of Mysore, Mysore-570 006
> India

As for isoCJ1, I made that line 25 years ago in Tim Tully's lab at Cold 
Spring Harbor. It's simply an isogenic line of white[1118] which had 
been repeatedly outcrossed to Canton-S.

I don't have it, and don't know if it's available (but it wouldn't be 
difficult to make an equivalent isogenic line yourself).

To outcross a mutant, simply cross your mutant and wild-type flies 
together. Select progeny (or grand-progeny if you're dealing with a 
recessive mutation) that show the mutant phenotype.

Note that this won't prevent selection for second-site suppressors, 
though -- that's the reason for isogenizing all the chromosomes.

Chris Jones