FISH using pairs of probes from distant segments of the same Drosophila chromosome reveals pairing of homologues in diploid interphase nuclei. In a minority of nuclei, the pairing of homologous loci is particularly intimate.
Wheat is pseudo hexaploid, containing a set of diploid chromosomes from each of three ancestors.
The chromosomes from different ancestries are called homoeologous chromosomes. Mutations in the Ph gene on chromosome 5B of wheat allow homoeologous pairing. Pairing is initiated at several sites along each chromosome. Synaptonemal complex formation does not require homology of nucleotide sequence once it has been initiated. Interphase pairing A weak chromosome pairing interaction occurs even in interphase cells.