Oocytes from All-Compound females produce anaphase I and meiosis II figures 64% of the time, i.e. they have bypassed metaphase I arrest.
A reversed acrocentric heterozygous for In(1)dl-49; it is useful in balancing because it is very stable, which is probably due to little interstitial heterochromatin. y w f detachments very rarely produced. Also produces a low incidence of homozygosis for w. C(1)DX/0 lethal
Some versions also marked with w1.
A study of metaphase arrest found that crossovers between homologs attached to the same centromere do not induce metaphase arrest. Hence exchanges induce metaphase arrest only when they physically conjoin two separate kinetochores. The signal that mediates metaphase arrest is not the exchange event per se, but the resulting tension on homologous kinetochores.