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Triplications and the problem of non-homologous crossing-over

1968; Cambridge University Press; Volume: 11; Issue: 2 Linguagem: Inglês

10.1017/s001667230001137x

1469-5073

H. Slizynska,

Plant Virus Research Studies

Two triplications induced in a normal halpoid chromosome complement by TEM (Tr-I) and by mustard gas (Tr-II) are described. Two models which may lead by successive steps to the formation of a triplication are suggested. The induction of two latent breaks is essential in both of them. The origin of repeats in general is discussed. It is concluded that chromosome breaks rather than non-homologous crossing-over constitute the major source of repeats.