expressed in cases in which the P and A alleles were simultaneously
identified. On the other hand, the hypothesis of silencing
an entire haplome, more specifically, the silencing of the
whole minority genome (P), as suggested by the exclusion of
this genome from meiosis in triploid PAA S. alburnoides [5],
was contradicted by these results, in which some genes
show expression of A as well as P alleles. This hypothesis appeared
initially to be a reasonable explanation because in
a system where mechanisms account for genetic exclusion
of a certain haplome (always P) as a way to overcome the ‘‘meiotic
crisis’’ imposed by triploidy, the mechanism used to
‘‘mark’’ the P genome could also be used and operate in
gene expression regulation