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The
allele arrangement (2+2+2+2) in the spores of Ascomycetes with ordered
spores that indicates a crossover between a locus and its centromere.
A pattern of ascospore genotypes for a gene pair showing that the
two alleles segregate into different nuclei only at the second meiotic
division, as a result of a single crossover between that gene pair
and its centromere; can only be detected in a ordered ascus. See First
division segregation |
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