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Volume 13, Number 2 >

CHROMOSOME STUDIES ON HETEROSEXUAL TWINS IN CATTLE : I SEX-CHROMOSOME CHIMERISM (XX/XY)

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/jjvr.13.2.33

Title: CHROMOSOME STUDIES ON HETEROSEXUAL TWINS IN CATTLE : I SEX-CHROMOSOME CHIMERISM (XX/XY)
Authors: KANAGAWA, Hiroshi Browse this author
MURAMOTO, Jun-ichi Browse this author
KAWATA, Keiichiro Browse this author
ISHIKAWA, Tsune Browse this author
Issue Date: Jun-1965
Publisher: The Graduate School of Veterinary Medicine
Journal Title: Japanese Journal of Veterinary Research
Volume: 13
Issue: 2
Start Page: 33
End Page: 41
Abstract: The chromosome constitution of 16 cases of bovine heterosexual twins consisting of 9 freemartins, 6 males co-twined with the freemartin and one non-freemartin female, and also 15 control animals consisting of 3 homosexual twin males, 4 single born males and 8 single born females were examined in blood cultures as well as in tissue cultures from various organs. The results are summarized as follows : 1) The diploid number of chromosomes in controls was 60. The 29 autosomal pairs were acrocentric in nature, while X and Y chromosomes were submetacentric. 2) In both freemartins and their co-twins, tissue cells of mesodermal and endodermal origin generally showed 2A-XX/2A-XY chimerism. A normal cow from the non-freemartin heterosexual twins was found to possess a normal female complement of chromosomes. Cell chimerism occurring in both the freemartins and co-twins is ascribed to a cell interchange as a result of vascular anastomosis.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/1806
Appears in Collections:Japanese Journal of Veterinary Research > Volume 13, Number 2

Submitter: 獣医学部図書室

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