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(a) AA×AB configuration [one parent is homozygous, the other, heterozygous, two classes of genotypes are observed among the progeny, AA (in red, left part) and AB (violet part, middle part)]. (b) AB×AB configuration [both parents are heterozygous, three classes of genotypes are observed among the progeny, AA (in red, left part) AB (in violet, middle part) and BB (in blue, right part)]. This figure is available in black and white in print and in colour at DNA Research online.
