1174.1 The discovery of the inheritance patterns of linked genesthe samechromosome? Do such allele pairs show anyregularities in their patterns of inheritance? Are therediagnostic ratios or other patterns that are associatedwith such genes? The answer to these questions is “Yes,there are simple patterns that are unique to genes thatreside on the same chromosome.” These patterns are thetopic of the present chapter.Once again, a key element of the analysis is the di-hybrid—an individual that is heterozygous for twogenes of interest (say,A/aand B/b). Suppose that thetwo genes are on the same chromosome. Such dihybridscould be represented as follows:At the simplest level, this chapter analyzes the inheri-tance patterns produced in the descendants of suchdihybrids.What would be the result of crossing the above dihy-brid? Rather than sorting independently,Aand Bwillmost likely be inherited together, as will aand b(they areafter all attached by the chromosome segment betweenthem). As a consequence, the inheritance pattern that re-sults will be different from those resulting from indepen-dent assortment. In some cases, however, the combina-
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