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Chiasma counts and non-disjunction frequencies in a normal ram and in rams carrying the Massey I (t1) Robertsonian translocation

Summary. Testicular material from a normal ram (54XY), three rams heterozygous (53XYt₁) and one ram homozygous (52XYt₁t₁) for the Massey I (t₁) translocation was examined. The autosomal non-disjunction in the normal ram was 2·0% compared to a mean of 6·1% in the heterozygous animals. In the homozygous animal there were adhesions of the tunica vaginalis to the cauda epididymidis and extensive spermatogenic arrest.

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