an idic ( xp -- ) in which the two x chromosomes are attached short arm to short arm , and which thus has two b regions ( the q-dark segment next to the centromere on xp ) between the inactivation centers , assumed to be situated on the q-dark region next to the centromere on xq , showed 63.8 % bipartite barr bodies as compared with 22.2 % formed by idic ( xq -- ) .
C0043292
x chromosomes
C1520168
xp