Synaptonemal complex analysis of hybrid cattle. I. Pachytene substaging and the normal full bloods.
Meiotic chromosome pairing abnormalities in full-blood and hybrid Bos taurus and B. indicus cattle have been surveyed by electron microscopy of pachytene synaptonemal complex spreads. In this paper the full-blood spreads are described in detail, including the use of XY and nucleolar morphology and other measured parameters for pachytene substaging. Pairing abnormalities were observed in up to 9% of the full-blood spreads. Most of these pairing abnormalities (83%) occurred in early-pachytene spreads, suggesting that the mechanism of synaptic adjustment may operate in cattle.
Dollin
A E
AE
Commonwealth Scientific and Industrial Research Organisation, Division of Animal Production, Blacktown, Australia.
Murray
J D
JD
Gillies
C B
CB
D000818:Animals; D002417:Cattle / Q000235:genetics*; D002466:Cell Nucleolus / Q000648:ultrastructure; D002869:Chromosome Aberrations; D002875:Chromosomes / Q000648:ultrastructure*; D008540:Meiosis; D008854:Microscopy, Electron; D013573:Synaptonemal Complex; D014960:X Chromosome / Q000648:ultrastructure; D014998:Y Chromosome / Q000648:ultrastructure