Three other Alpha-Amy loci, namely, Amy 6B2, Amy 6D2, and Amy 7B2, are reported (568). No variation was observed for the products of Amy 6D2 and Amy 7B2, although nullisomic analysis located the genes in 6DL and 7B, respectively. In accordance with the Guidelines, these genes are assumed to be part of the Alpha-Amy-D1 and Alpha-Amy-B2 loci, respectively. Amy 6B2 was observed to produce alternative phenotypes (568). In a test of the segregation of these phenotypes relative to two alternative products of Amy 6B1, the two loci were found to be linked with a recombination frequency of 20.6% (568). However, an attempt to confirm the presence of more than one Alpha-Amy locus in 6BL was unsuccessful (576).
