Mutation of the donor splice site of the third intron.
G23272726A
GT to AT mutation in the splice donor site
Meiotic recombination is reduced but not absent. Mutation does not interfere with ord4 activity: does not show negative complementation.
Transmission rate of Dp(1;f)J21A through females to progeny is 28%, ord mutation has no effect on transmission. Mutation has no effect on Dp(1;f)J21A transmission in males.
Level of chromosome missegregation in homozygous females is 60.2%.
Increased frequency of premature sister chromatid disjunction: homozygous females are fertile.
ord1/ord3 has phenotype, non-suppressible by anon-59Da3.6RR
Strong allele.
Does not interact with ord4 to alter the female meiotic chromosome segregation phenotype.