Almost all oocytes from mei-2186-7 homozygous mothers fail to arrest at metaphase I. No defects are seen in sister chromatid cohesion.
Crossing over frequency is reduced compared to wild type. Reduction in crossing over is twofold less in the centromere proximal regions compared to the distal regions. High levels of nondisjunction on the X chromosome, lower levels on the 4th chromosome.
Reduces meiotic exchange.