File:The Journal of experimental zoology (1913) (14780239182).jpg

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Identifier: journalofexperim15harr (find matches)
Title: The Journal of experimental zoology
Year: 1913 (1910s)
Authors: Harrison, Ross G. (Ross Granville), 1870-1959 Brooks, William Keith, 1848-1908 Wistar Institute of Anatomy and Biology American Society of Zoologists
Subjects: Zoology
Publisher: (New York, etc.) Wiley-Liss (etc.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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583 PLATE 1 EFPECTS OF ULTRA-VIOLKT LIGHTI EXPLANATION OF FIGURES 1 Tliis scalr shows ultra-violet light contraction. It was one of an invertedpair. 2 One of the scales exposctl to ultra-violet light with (hat in figure 1 butturned face-up. 3 An unexposed control scale in 0.1 M. NaCl. 4 One of the inverted scales showing recovery from ultra-violet light con-traction 10 minutes after a 10-minute exposure. 5 A scale showing complete recovery from ultra-violet light contraction 20minutes after a 10-minute exposure. 6 An unexposed scale in 0.1 M. NaCl. 584 PHYSIOLOGY OF CHROMATOPHORES OF FISHES R. A. SPAETH PLATE 4
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585 NON-DISJUNCTION OF THE SEX CHROMOSOMES OF DROSOPHILA CALVIN B. BRIDGES The Zoological Laboratory, Columbia University A certain kind of exception that has come up during the courseof my work on Drosophila ampelophila, with Dr. T. H. Morgan,bears directly upon the problem of sex determination, and espe-cially upon the view that the chromosomes are the carriers ofthe differentiators of the hereditary characters. The evidencewhich I am to present deals with the X-chromosome^ of Droso-phila, concerning which the evidence relating to sex linkage andthe linear arrangement of factors is more definite and completethan in any other case. Ordinarily, when a female with whiteeyes is mated to a wild male with red eyes, the daughters havered, and the sons, white eyes. This is a typical case of the criss-cross inheritance characteristic of sex linkage. The cytologicalevidence of Miss Stevens shows that Drosophila belongs to thatgroup of forms in which the female has two X-chromosomes andthe mal

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