2 resultados para prophase
em Indian Institute of Science - Bangalore - Índia
Resumo:
Sporadic instances of tetrasomaty in the primary and secondary roots of five varieties ofCicer arietinum Linn. are illustrated. The phenomenon was more common in Varieties I and II. The SAT-chromosomes are reliable guides to estimate the degree of polysomaty, since pre-treatment withp-dichlorobenzene revealed that cell types with 32 chromosomes at metaphase had two pairs of SAT-chromosomes associated with the nucleolus at prophase. Tetrasomatic cells appear to be limited to the dermatogen and periblem. Higher degrees of polysomaty were not observed.
Resumo:
The behaviour of the nucleoli from mitotic prophase till the end of telophase is illustrated. Since at prophase, the SAT-threads appear embedded in the nucleolar matrix, their orientation in the mass and the rate of dissolution of the latter would determine whether this relationship would continue till meta- or ana-phase. The persistence of the nucleoli-SAT association often till anaphase indicates that the movement of such nucleoli on the spindle is governed by that of the SAT-chromosomes.