in these pairing could have begun at any point in the interstitial segments , but not likely in segments close to the centromeres.-multiple secondary sites which vary in time or in order of pairing will explain the variation in position of the cross-shaped pachytene configuration in interchange heterozygotes.-the observed configuration in any one cell is the result of a particular combination of pairing events at the various sites .
C0007709
centromeres
C0007634
the