Abstract
<i>Potorous tridactylus</i> and <i>Protemnodon bicolor</i> are marsupial species in which the sex chromosome system is XX/XY<sub>1</sub>Y<sub>2</sub>. Nearly all the long arm of the X is homologous with the Y<sub>2</sub>; the short arm of the X is unpaired in the male. During the last part of DNA synthesis in females only the short arm of one of the 2 X-chromosomes shows asynchronous synthesis of DNA. The long arm sof the X’s and homologous autosomes synthesize DNA synchronously. Some pairs of non-homologous autosomes synthesize asynchronously. The implications of this in terms of the Lyon hypothesis and the evolution of X-chromosomes are discussed.
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