It is a (notorious) coincidence that most of the mapping I did in 1947-48 involved markers in the first 10 mins. When we picked
up Mal, Str by 1951 we had to draw "non-linear" maps, as you know. The Wollman et al. discovery of progressive DNA
transfer revolutionized how we have to look at mapping.
We nevertheless had some reservations whether that was the whole story; and I have now been returning to some more
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thinking about that.
Barbara, my question to you is for bibliography, perhaps 1960-1985, on crossing-over in K-12 crosses specifically involving
markers -- through the larger part of the chromosome, and over intervals of multiples of 10 minutes. To allow for progressive
transfer, these might entail selection for distal markers, and with well-defined, stable Hfr males.
I hoped that you might have biblio
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graphy at your fingertips that would take me weeks to assemble. I haven't really thought about this problem in 15 or 20
years, so even the obvious might be helpful to me.