Abstract
The segregation of achiasmate chromosome pairs at meiosis I is not brought about by a single ‘distributive system’ as previously thought, but rather by two separate mechanisms. One system uses the pairing of proximal heterochromatic sequences to mediate the segregation of achiasmate homologs - an observation that, at long last, defines a function for heterochromatin. The other system facilitates the segregation of heterologous chromosomes, by an as yet undiscovered mechanism.
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