Research Notes : Linkage tests between the Ap and W1 loci
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The F2 generation of the cross 'Williams' x 'Manchu (Madison)' was used to determine if the Ap and W1 loci were linked. The Ap locus controls a seed acid phosphatase which exists in the germplasm in three different electrophoretic forms controlled by three codominant alleles -- Ap^a, Ap^b and Ap^c (Hildebrand et al., 1980). The W1 locus controls flower color--purple (W1) and white (w1).