The North American Species of Drosophila PDF ePub eBook

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The North American Species of Drosophila free pdf Excerpt from The North American Species of Drosophila Drosophila melanogaster Meigen (ampelophila Loew) has in recent years come to be widely used as a laboratory animal, especially in the study of heredity. Its short life-cycle, great productivity, and the ease with which it may be bred have been chiefly responsible for making it so popular for this purpose. These small flies have been used not only in the study of genetics, but also in investigations dealing with cytology, behavior, and various phases of physiology. It has also been found that several other members of the same group are amenable to laboratory life, and these species offer numerous additional possibilities for interesting experimental work, which are now beginning to be exploited. In view of these facts, it has seemed to the writer that a systematic review of the group would be desirable. No comprehensive study of the American forms has hitherto been made, so that our knowledge of the number of species and of their distribution and habits is very fragmentary. Furthermore, much of the published data on these points is unreliable, for the reason that different names have sometimes been applied to the same form, or different forms have been given the same name. Even when material has been identified by the same entomologist, there is a large possibility of inconsistency and this applies to the writers own determinations, for it is very easy to go astray when identifying pinned material. It is hoped, however, that a beginning has been made in the undertaking of bringing order out of something very like chaos. There was another, somewhat different, reason for making a systematic study of the group. There has been a very large number of mutations discovered in the laboratory races of Drosophila melanogaster Meigen, and also of other species, particularly of D. virilis Sturtevant. It seemed to the writer that it would be of considerable interest to get an idea of how these mutations compare with the differences between wild species of Drosophila. The comparison is difficult to make without crossing species and comparing the inheritance of mutations with that of specific differences. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully- any imperfections that remain are intentionally left to preserve the state of such historical works.

About A H Sturtevant

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Details Book

Author : A H Sturtevant
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1332051502
EAN : 9781332051502
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 166 pages
Age + : 15 years
Language : English
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    . Excerpt from The North American Species of Drosophila Drosophila melanogaster Meigen (ampelophila Loew) has in recent years come to be widely used as a laboratory animal, especially in the study of