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Chiasma Studies in Structural Hybrids

1960; International Society of Cytology; Volume: 25; Issue: 3-4 Linguagem: Inglês

10.1508/cytologia.25.476

1348-7019

Hiroshi Kayano, Koya Nakamura,

Gene expression and cancer classification

1. Kinetochores of the 3 heteromorphic chromosomes involved in a fusion heterozygote separate always reductionally at AI.2. In a translocation heterozygote two interstitial segments, between the kinetochore and the point of interchange, were distinguished, viz., one each of the pairs I and II. Pair I formed one chiasma or two chiasmata with the frequency 94.0 per cent and 6.0 per cent respectively, and pair II no chiasma in 18.0 per cent and one chiasma in 82.0 per cent of the cases.3. The heteromorphic chromosomes of pair I separated equationally in 93.3 per cent of the cells and those of pair II in 90.0 per cent.4. The conformity of the chiasma frequency with the frequency of equational Al separation affords good support for the chiasmatype hypothesis.