The severe phenotype of females with tiny ring X chromosomes is associated with inability of these chromosomes to undergo X inactivation .
the severe phenotype of females with tiny ring x chromosomes is associated with inability of these chromosomes to undergo x inactivation .
O O O O B-multi_cell O B-DNA_molecule I-DNA_molecule B-DNA_molecule I-DNA_molecule O O O O O O B-DNA_family_or_group O O B-other_name I-other_name O