Pathak S, Hsu T C
Chromosoma. 1976 Sep 10;57(3):227-34. doi: 10.1007/BF00295209.
Using C-banded preparations of Mus dunni it is possible to study the behavior of constitutive heterochromatin in early stages of meiotic prophase. The X and the Y chromosomes, both of which contain a large amount of heterochromatin, lie apart in leptotene but move toward each other during zygotene. They then form the sex vesicle at late zygotene. In autosomes zygotene pairing appears to start from the telomeric ends. The centromere of the Y chromosome associates end-to-end with the terminal end of the long arm of the X chromosome. The autosomal heterochromatic short arms show forked morphology in certain bivalents at pachytene, suggesting probable incomplete synapsis.
利用邓氏小鼠的C带标本，可以研究减数分裂前期早期组成型异染色质的行为。X染色体和Y染色体都含有大量异染色质，在细线期彼此分开，但在偶线期相互靠近。然后它们在偶线期末期形成性泡。在常染色体中，偶线期配对似乎从端粒末端开始。Y染色体的着丝粒与X染色体长臂的末端端对端相连。常染色体异染色质短臂在粗线期的某些二价体中呈现叉状形态，提示可能存在不完全联会。
