Since no kinetochore forms, the chromatids are not connected at secondary constrictions. Instead, for the hemizygous sex chromosome, we say that dominance is not defined . Two simultaneous translocations. The variegation has considerable variable expressivity. Sometimes allows the establishment of phylogenetic relatedness of species .
Deletions change the genetic map.
When homozygous the map is missing loci in the deletion and the map is shorter. When heterozygous, the loci on either side map are closer due to no crossing over where pairing is impossible. They supply additional genetic material that is capable of evolving new function since one functional copy is present. Give an example. Bar locus in Drosophila.