Cytological similarity between the heterochromatin of the large X and Y chromosomes of the soft-furred field rat, Millardia meltada (family: Muridae)
- 1 January 1981
- journal article
- research article
- Published by S. Karger AG in Cytogenetic and Genome Research
- Vol. 30 (2) , 77-82
- https://doi.org/10.1159/000131594
Abstract
Patterns of DNA replication, fluorescence, and meiotic pairing have been studied in the composite X and Y chromosomes of a rodent, the soft-furred field rat, Millardia meltada. The heterochromatin of both the chromosomes replicates during late S and fluoresces brightly with Netropsin-Olivomycin. The fluorescence with Actinomycin D-Hoechst is dull, suggesting that the heterochromatin of both the X and the Y is relatively GC-rich. When surface-spread testis cells are analysed after silver staining considerable portions of the X and Y exhibit synapsis. On the basis of this study it appears that the heterochromatin of the X chromosome of M. meltada is substantially similar to that of the Y chromosome.Keywords
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