The cell in development and inheritance . he cases of this type the tetrads arise fromring-shaped bodies which are analogous to the ring-shaped chromo-somes occurring in heterotypical mitosis (p. 86). First observed byHenkingCgi) in Pyrrhocoris,\.Q.\xz.^-ox\g\xs. of this type has since beenfound in other insects by Vom Rath, Toyama, Paulmier, and others, ORIGIN OF THE TETRADS 249 in copepods by Riickert, Hacker, and Vom Rath, in pteridophytes byCalkins and Osterhout, in the onion, Alliinn, by Ishikawa, and invarious other forms where their history has been less clearly madeout. The genesis of
The cell in development and inheritance . he cases of this type the tetrads arise fromring-shaped bodies which are analogous to the ring-shaped chromo-somes occurring in heterotypical mitosis (p. 86). First observed byHenkingCgi) in Pyrrhocoris,\.Q.\xz.^-ox\g\xs. of this type has since beenfound in other insects by Vom Rath, Toyama, Paulmier, and others, ORIGIN OF THE TETRADS 249 in copepods by Riickert, Hacker, and Vom Rath, in pteridophytes byCalkins and Osterhout, in the onion, Alliinn, by Ishikawa, and invarious other forms where their history has been less clearly madeout. The genesis of the ring was first determined by Vom Rath inthe mole cncktt {Giyllotalpa, 92), and has been thoroughly elucidatedby the later work of Riickert (94), Hacker (95, i), and Paulmier(99). All these observers have reached the same conclusion;namely, that the ring arises by the longitudinal splitting of a primarychromatin-rod, the two halves remaining united by their ends, andopening out to form a ring. The ring-formation is, in fact, a form of.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
