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The XY bivalent in human male meiosis
Author(s) -
HULTÉN MAJ,
LINDSTEN J.,
MING PENMING L.,
FRACCARO M.
Publication year - 1966
Publication title -
annals of human genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 77
eISSN - 1469-1809
pISSN - 0003-4800
DOI - 10.1111/j.1469-1809.1966.tb00012.x
Subject(s) - bivalent (engine) , chiasma , meiosis , homologous chromosome , secondary constriction , biology , centromere , genetics , x chromosome , bent molecular geometry , metaphase , chromosome , chemistry , gene , organic chemistry , metal
Summary The X Y bivalent could eady be recognized in diakinesis and first metaphase in air‐dried preparations. The X and Y were clearly separated in varying proportions of these cells but probably more often in cells in the later stages. No chiasma could be demonstrated with certainty between X and Y . The Y chromosome had in some cells a clear constriction at its distal end which might indicate the centromere, and it was often bent in a characteristic way. The X chromosome was also typically bent in some cells, and sometimes demonstrated one less contracted part close to the Y and one contracted and irregularly curved distal part. It is tentatively suggested that the long arm of Y is associated with the short arm of X . The point is stressed that the problem of the existence of homologous sections of the X and Y chromosomes in man cannot be solved by present cytological observations in the absence of genetical evidence.