The significance of the G-bands and C-bands of three different Robertsonian translocations of domestic sheep (Ovis aries)

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Abstract
G-banding of three different Robertsonian translocations of domestic sheep (MI, MII, and MIII) has shown that the arm components of each are nonhomologous. The C-bands of the MI and MIII translocation chromosomes showed heavy blocks of centric heterochromatin which were distributed evenly on either side of the centromeric constriction and which suggested a dicentric structure. The C-band pattern of the MII translocation was regularly exocentric, suggesting that it may be formed by reciprocal translocation. The need for caution on the use of the term “Robertsonian translocation” is discussed. The amounts of centromeric heterochromatin in each of the translocation chromosomes is apparently greater than in the regular metacentrics, which suggests that they are of a more recent origin.

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