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[biobutterfly]

I am trying to use a Southern to detect the number of homologs.  I suspect there are three but need to test.  If I use a dot blot to determine the concentration of gDNA to run out on the gel, will that number actually be correct?  If, for example, my probe shows a nice signal with 10ug dotted, won't the signal be much weaker when the DNA is all separated out on the gel?  Is that linear?  Can I just scale up?

Thanks for the help.

[bob1]

If you are using all three probes in the same hybridisation, the the signal for each should be approximately a third of what you see on the dot blot, assuming equal binding and labeling of the probes.

I would try to dot blot with each of the probes separately to see the signal strength of each, and then use the weakest as the basis for loading.