Abstract
An individual male red kangaroo (Macropus rufus) was found to display unaligned kinetochores on one synaptonemal complex. This was the result of synaptic adjustment caused by heterozygosity for the size of a C-band near the centromere of this bivalent, the first report of synaptic adjustment at a C-band heterozygosity. The observation suggests a possible method of obtaining further insights into the process of synaptic adjustment.