Abstract
In autoradiographs, following tritium labelling at late S, analyses of the distributions of silver grains along the chromosomes of Scilla campanulata led to the following conclusions. 1. 1. The variation in amount of DNA replication between chromosomes at late S is directly proportional to chromosome length. 2. 2. Within chromosomes the amount of DNA replication per unit of length varies between different regions. It is lowest near to the ends and in the vicinity of the centromere, highest in interstitial regions away from the centromere. It follows that DNA replication is completed earlier near to the centromeres and at the ends than elsewhere. 3. 3. The “end” and “centromere” effects upon DNA replication at late S are of the same order of magnitude.
Published Version
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