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Heterochromatin, synaptonemal complex, and NOR activity in the somatic and germ cells of a male domestic dog, Canis familiaris (Mammalia, Canidae)

by S Pathak, P Van Tuinen, D E Merry
Cytogenetics and Cell Genetics ()


C-banding and silver staining of the somatic and germ cells of the male domestic dog, Canis familiaris, have shown that: the amount of C-banding is small compared to most other mammalian species, three pairs of autosomes have nucleolus organizer regions (NORs) at the terminal ends of their long arms, whereas the Y chromosome has an NOR on the terminal end of the short arm, the organization of the synaptonemal complex (SC) is similar to that of other mammalian species, a distinct SC is formed between the long arm of the Y chromosome and probably the short arm of the X chromosome, and the differential axes of both sex chromosomes do not demonstrate fusiform thickenings nor do they stain darkly with silver as do the XY bivalents in many other mammalian species.

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