Abstract
The chromosome late-replication patterns of five mouse × Chinese hamster somatic cell hybrids with reduced hamster complements were compared with those of the Chinese hamster parent cell, in order to determine whether the sequential order of chromosome replication is dependent on the presence of the whole chromosome set. In all hybrid clones the parental pattern could be recognized in a variable proportion of cells, although different chromosomes were missing in each clone. The results suggest that sequential order of replication is not the consequence of any sort of interaction between replication units (such as competition for limiting factors), and point to a considerable degree of autonomy in replication of individual chromosomes or chromosome parts.
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