Talk about the case of three pairs of chromosomes for reciprocal translocation arrangements.

Derivates pair up in hexavalent star-like configuration Four cases: -Robertsonian translocation: in this case, three chromosomes will pair up forming trivalent structure (trisomy) -Deletion: formation of a DNA loop of deleted segments in the homologous chromosome for the normal one. -Duplications: DNA loop in duplicated region. -Inversions: only able to pair up by inversion loop. inversion heterozygous if only one is inverted.