Document Detail

The chromosomes of cockerels (Gallus domesticus) during meiosis.
MedLine Citation:
PMID:  679727     Owner:  NLM     Status:  MEDLINE    
The chromosomes in spermatogenic cells of 10 cockerels were examined. Prior to removing the testes, the birds had been injected with either 2.5 mg vinblastine sulfate or 5 mg colchicine, or were untreated. A cell suspension was made from small pieces of testis and slides were prepared using an air-drying technique. Pretreatments of the birds increased the numbers of spermatogonial and secondary spermatocyte cells at metaphase and rendered them more amenable to analysis. The modal number of macrochromosomes or bivalents was observed in 90.2% of spermatogonia, 98% of primary spermatocytes at diakinesis, and 94.2% of secondary spermatocytes. Polyploid cells at all stages were thought to be largely artifacts of the procedure. Aneuploidy was rare, being found in only 1% of secondary spermatocytes. It is estimated that between 56 and 66 chiasmata occur in the 39 bivalents; of these, an average of 28 are seen in the six macrobivalents. Average numbers were 8.1, 5.9, 4.6, 3.6, 2.4, and 3.5 for macrobivalents 1 through 5 and the Z respectively. The numbers of chiasmata differed significantly among birds but were not differentially affected by pretreatment of the birds.
D L Pollock; N S Fechheimer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cytogenetics and cell genetics     Volume:  21     ISSN:  0301-0171     ISO Abbreviation:  Cytogenet. Cell Genet.     Publication Date:  1978  
Date Detail:
Created Date:  1978-10-27     Completed Date:  1978-10-27     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0367735     Medline TA:  Cytogenet Cell Genet     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  267-81     Citation Subset:  IM    
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MeSH Terms
Cell Count
Chickens / genetics*
Crossing Over, Genetic
Spermatocytes / cytology,  ultrastructure
Spermatogonia / cytology,  ultrastructure
Testis / cytology

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