126Chapter 4 •Eukaryote Chromosome Mapping by Recombinationanalyzed. Henceforth the genes must be written in cor-rect order.Second, we have deﬁnitely established that ctis be-tween vand cv, and we have established the distancesbetween ctand these loci in map units. But we havearbitrarily placed vto the left and cvto the right; themap could equally well be inverted.Third, note that linkage maps merely map the lociin relation to one another, with the use of standard mapunits. We do not know where the loci are on a chromo-some—or even which speciﬁc chromosome they are on.In subsequent analyses as more loci are mapped in rela-tion to these three, the complete chromosome mapwould become “ﬂeshed out.”careful in our classiﬁcation of parental and recombinanttypes. Note that the parental input genotypes for thetriple heterozygotes are v±²cv²ct and v²cv±²ct±;any combination other than these two constitutes a recombinant.
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