Homocompound chromosomes are classified according to relative orientation of their arms (i.e., tandem, reversed or ring) and the position of their centromeres (i.e., acrocentric or metacentric): reversed acrocentrics (C(n)RA), reversed metacentrics (C(n)RM), reversed rings (C(n)RR), tandem acrocentrics (C(n)TA), tandem metacentrics (C(n)TM), and tandem rings (C(n)TR), where n is a the number of a