HE chromosomes of cultured cells of the marsupial, Potorous tridactylis, have Tbeen described by WALEN and BROWN (1962) and SHAW and KRooTH (1964).The low number and the individuality of these chromosomes make this material particularly favorable for studies of chromosome duplication and segregation with tritiated thymidine techniques.There are ten autosomes and two X chromosomes in the female, and ten autosomes, one X and two Y chromosomes in the male.Studies with tritium-H3 on several animal and plant cells have been reported since the initiation of chromosome labeling with tritium by TAYLOR, WOODS and
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Kirsten H. Walen (1965) studied this question.
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