Biographical Memoirs Volume 62 (1993) / Chapter Skim
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Pages 369-378
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From page 369... ...
FRANZ SCHRADER March 11, 1891-March 22, 1962 BY KE N N E T H W C O O P E R / THE ONLY CHILD of Franz Schrader and Hedwig Dorothea Rohde, Schrader received his early schooling in the cloister of the magnificent MagUeburg Cathedral and the Magcleburger Burgerschule.
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370 BIOGRAPHICAL MEMOIRS to his own interests, Columbia College, from which he gracluated (B.S., 1914~. Following college and two summers (1915, 1916)
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FRANZ SCHRADER 37 and haplo-diploid parthenogenetic species. In these coccids, one set of chromosomes of the diploid mate undergoes heteropycnosis, leading, he surmised, to inactivity and ultimately to effective haploidy of the nominally diploid male.
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372 BIOGRAPHICAL MEMOIRS member of the National Academy of Sciences (1~951)
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However, on the basis of his study of the consistency of paths taken by the fibrous components of spindles in fixed cells tiu5~', anct on the results of his carefully controlled centrifugation experiments with living cells (1934) , Schrader concluded that spindles in living cells do indeed have a fibrous structure, albeit an invisible one.
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surfaces. These two sorts of kinetochores appear to be mutually exclusive, for all chromosomes of an organism's complement in a given cell have either localizes!
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FRANZ SCHRADER 375 property was first proved by Hughes-Schrader and Hans Ris (1941)
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376 BIOGRAPHICAL MEMOIRS tion as bivaTents c segregation. From his very early work ~ ~ 923 )
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FRANZ SCHRADER 377 The harlequin lobe phenomena therefore are Lightly significant, for, side by sicle, they present an aberrant meiosis and the normal meiosis from which it was derived. Schrader believed that theoretical resolution of these and other problems would require painstaking comparative physicochemical investigation of the astonishing variety of cytological conformities and nonconformities.
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From page 378... ...
378 BIOGRAPHICAL MEMOIRS Schraders to these anc! still other cases is not the only possible one, but the chief basis today for rejecting their hypothesis lies in the fact that it is counter to widespread belief.
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