1978•CYTOLOGIAOpen access

Instability of chromosome number in Nothoscordum fragans Kunth.

Nagib M. A. Nassar, Margarida L. R. de Aguior

Abstract

The study of the somatic complement of Nothoscordum fragans showed the occurrence of mosaicism in root tips. Besides common biotype 2n=13m+6t, cells with different chromosome constitutions were found: 2n=12m+8t, 2n=12m+6t. It is assumed that these complements were derived from the 2n=19, by centric fission in the first case and elimination of a m chromosome in the second one. Preliminary observations of meiosis showed different chromosome constitutions in Anaphases II.

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Key concepts: Biology, Chromosome, Chromosome number, Meiosis, Somatic cell, Complement (music), Genetics, Molecular biology