The Chromosomes of the Field Mouse Akodon azarae (Cricetidae, Rodentia) with Special Reference to Sex Chromosome Anomalies

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Abstract
The chromosomes of the field mouse Akodon azarae have been investigated. In males the diploid chromosome number is 38, with XY sex chromosomes. The four types of chromosome constitution in females are as follows: (a) 38 chromosomes with XX sex chromosomes; (b) 38 chromosomes Xx, the x being a grossly deleted X chromosome; (c) 38/37 Xx/XO sex chromosome mosaic; and (d) 37 chromosomes with an XO sex chromosome complement. This variability in females is believed to result from a dosage compensation mechanism ranging from X chromosome inactivation to total elimination of the X chromosome.

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