fish versus interspecific backcrossing

[marcvdc at lmb1.rug.ac.be]

Dear netters,


1)  I want to determine the chromosomal location of a MOUSE cDNA.
     I think I can do this in two ways; doing a FISH or performing interspecific backcrossing.
     Do you know  which technique is most precise in determining the 
     chromosomal location ?
     Is there an even beter technique ?

2)  Are there organisations who distribute mouse gDNA  to perform interspecific
     backcrossing?



Thank you for your reply,

Marc Van de Craen