Imprecise excision of the P{lArB}eastETX3 element.
The easthop-2 phenotype is associated with a significant rate of nondisjunction of achiasmate X-chromosomes in female meiosis. Nondisjunction occurs during the segregation of homologs in meiosis I. The segregation of the achiasmate chromosome 4 is not affected.
V. Rodrigues