Other Pages Facts leptotene early zygotene late zygotene . . . Axial elements approach one another, acquiring lateral elements . Mature synaptonemal complexes consist of a pair of paralell axial elements flanking a central element . The elements are connected by transverse fibers.
Fewer nodules are present after desynapsis.
In late pachytene there are twice as many nodules as in early diplotene, but they have different appearances, making it uncertain as to whether early nodule mature into late ones or late nodules arise de novo. In diplotene, chromosomes appear physically linked at chiasmata . The number of late nodules is approximately the same as the number of genetic cross-over events . The width of the SC is increased by engineering the ZIP1 gene to produce a larger protein. Other Pages Interpretations Contrary to intuition, SC formation is not necessary for strand exchange between DNA duplexes.