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The Temperature-Effective Period of the Scute-1 Phenotype

Ives, Philip Truman (1935) The Temperature-Effective Period of the Scute-1 Phenotype. Proceedings of the National Academy of Sciences of the United States of America, 21 (12). pp. 646-650. ISSN 0027-8424. https://resolver.caltech.edu/CaltechAUTHORS:IVEpnas35

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Abstract

Introduction. - The recently published papers of Child [1] have shown that for temperatures ranging from 14 to 31°C. there exists a temperature-effective period for the scute-1 phenotype which lies entirely within the latter half of the third larval instar period, when a mass of flies is concerned. For all bristles of the scute pattern, and at all temperatures tested, the effective period occupies the same relative position in the developmental period; and it is apparently restricted to the period between 89.3 and 96.8% of egg-larval development for any individual fly. The study reported here is likewise on the temperature-effective period of the scute-1 phenotype, and differs only in the technique used. The temperatures used in this experiment were 25° and 40° to 41°C. Developing larvae cannot usually live through more than five hours at 40° to 41°C.; but three-hour exposures are generally not excessively lethal. The results of the study are interesting largely because they differ markedly from those of Child. A temperature-effective period appears which, for the ocellar bristles, extends through all the developmental periods tested, from the time of egg laying through the early pupal period. Other bristles considered also show effective periods which lie outside the time of Child's temperature-effective period.


Item Type:Article
Additional Information:Copyright © 1935 by the National Academy of Sciences Communicated November 12, 1935 [P.T.I. was] [t]he Rufus B. Kellogg Research Fellow of Amherst College, Amherst, Massachusetts.
Issue or Number:12
Record Number:CaltechAUTHORS:IVEpnas35
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:IVEpnas35
Alternative URL:http://www.pnas.org/content/vol21/issue12/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5710
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:29 Oct 2006
Last Modified:02 Oct 2019 23:25

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