Sobre o comportamento mitótico e meiótico de cromossomas policêntricos ou com ponto de inserção difuso

Chromosome biology of the scorpionPalamnaeus sp

“…Brieger and Kerr (1949) have opined that the scorpion chromosomes should be considered as holocentric. Radiation studies of Rhoades and Kerr (1949) have suggested the diffused or polycentric nature of scorpion chromosomes.…”

“…Even though the cytology of scorpions is well documented, the architecture of the chromosomes, especially the nature of the kinetochore, has been highly controversial (Piza 1943(Piza , 1947(Piza , 1948(Piza , 1950(Piza , 1957Brieger and Graner 1943;Brieger and Kerr 1949;Sharma and Joneja 1959;Sharma et al 1959;Srivastava and Agarwal 1961;Guenin 1957Guenin , 1961Venkat~narasimhaiah andRajasekaxasetty 1964, 1965;Venkatanarasimhaiah 1965). All the previous workers studied the chromosomes in sectioned and squash materials.…”

Absence of Chiasmata and Formation of a Complex Chromosomal Body in the Spermatogenesis of the ScorpionPalamnaeus Longimanus

“…-BRIEGER and KERR (1949) consider the chromosomes of the species of scorpions that they have studied to be polycentric or to possess diffuse centromeres. This conclusion is based upon the fact that during anaphase, the chromosomes, as they move polewards, present their entire length towards the pole, being constantly at right angles to the longitudinal axis of the spindle, and do not have one end directed towards the pole.…”

“…It has been contended by BRIEGER and KERR (1949) that the scorpion chromosomes are polycentric, although PlzA believes, on the basis of the evidence of his own material, that they are bicentric.…”