Word: geneticists
(lookup in dictionary)
(lookup stats)
Dates: during 1930-1939
Sort By: most recent first
(reverse)
...longtime protégé of Nobel Prizeman Thomas Hunt Morgan and now a famed geneticist in his own right, Dr. Calvin Blackman Bridges of Carnegie Institution of Washington breeds thousands of fruit flies in glass jars, studies their variations and heredity mechanisms under the microscope. Dr. Bridges knows a great deal about genes, the infinitesimal control switches of heredity, and he has detected in the chromosomes of his little insects patterns that may consist of the genes themselves (TIME, March 9). In Los Angeles last week photographers snapped the biologist standing beside a strange three-wheeled automobile. Designer...
...geneticist will say that he has seen a gene, but last week Dr. Bridges would not say that he had not seen one. The chromosomes themselves in the fruit fly's germ cells are no larger than .00015 inch long, minute dots and streaks under the best microscopes. The chromosomes in the fly's salivary glands, however, are 70 times bigger than those in the germ-plasm, and two years ago Dr. Theophilus Shickel Painter of University of Texas took pioneer photographs of these tiny giants showing cross-bands. Then Dr. Bridges made such good photomicrographs...
...done. Strolling contentedly among his third-generation hybrids, Mr. Burpee was astounded to spy a golden super-double hybrid nasturtium with nearly 60 petals and three inches across. This was the result of a chance mutation, an obscure dislocation of the hereditary mechanism of the sort that many a geneticist holds responsible for evolution. "The nasturtium was most carefully watched," said Grower Burpee, "in every stage of development. Every flower was examined and it was discovered that these super-double flowers were entirely female sterile. They kept on blooming and never went to seed." Because they are "female sterile...
Facts of this sort were pointed out to the American Association for the Advancement of Science in St. Louis last week by Dr. Oscar Riddle, 58, crack geneticist of the Carnegie Institution of Washington, in an address entitled "The Confusion of Tongues." Dr. Riddle asserted that it was high time for science to carry evolution back not only to primordial organisms, but to their natural production from wholly inanimate substances. It has been learned that all that is necessary for the spontaneous generation of certain sugars is sunlight, colored surfaces, water, carbon dioxide, moderate temperatures. Such factors were undoubtedly present...
...inheritance was obvious from her output. The problem remained how to evaluate the bull's transmitting capacity. The Prentice group chose the method of systematically comparing the yield of bulls' daughters with the yield of their dams. In such wise Mr. Prentice's geneticist-in-chief arrived at Mount Hope's crowning achievement-the Mount Hope Bull Index...