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Sinopsis
Excerpt from An Analysis of the Effects of Selection
The data published by Muller (1916) give the locus as from sepia (the locus farthest to the left of those as yet discovered), and from spineless, on the right. My own (unpublished) data give.
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Excerpt from An Analysis of the Effects of Selection
Because of the information given by this table it has seemed de sirable to present the data for males and females separately. This has been done in the Appendix; but since the dimorphism is slight, the data have been lumped in the statistical treatment given in the body of the paper. The data in the Appendix make it possible to re calculate the constants separately if it should seem desirable to do so.
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.
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Excerpt from An Analysis of the Effects of Selection
The present paper describes a series of experiments aimed at determining the causes of the variability in bristle number observed in Dichsæt, a mutant race of Drosophila melanogaster (ampelophila). These experiments are discussed under several headings, as follows:
(a) Selection of plus and of minus variants was carried out. Both plus and minus lines were obtained and were used in the further experiments.
(b) A plus line and a minus line were crossed, and an increase in variability was observed in F2.
(c) Linkage tests were made, and by this means it was demonstrated that modifying genes were present in the selected lines.
(d) Evidence against the hypothesis of contamination of allelomorphs was obtained.
(e) This evidence, and that obtained by other investigators, is then utilized in a general discussion of the selection problem, and of the hypothesis of contamination of genes. The conclusions are drawn that selection is usually effective only in isolating genetic differences already present; and that genes are relatively stable, not being contaminated in heterozygotes, and mutating only very rarely.
The mutant character known as Dichæt was discovered by Dr. C. B. Bridges, July 3, 1915. In an experiment involving the sex-linked characters sable, forked, and cleft there appeared a single female that had wings extended and bent backwards near the base, like those of the mutant bent (Muller, 1914b). In addition it was observed that this female had only 2 dorso-central bristles, instead of the 4 usually present. When mated to a male having the mutant character eyeless, this female produced 48 normal offspring and 46 "Dichæt," thus showing the character to be dominant.
Bridges's unpublished data show that the Dichæt gene is in the third chromosome, approximately 5 units to the left of pink.
The data published by Muller (1916) give the locus as 9.7 from sepia (the locus farthest to the left of those as yet discovered), and 11.0 from spineless, on the right.
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.
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An Analysis of the Effects of Selection (Classic Reprint)
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Paperback. Condición: New. Print on Demand. This book is a comprehensive analysis of the effects of selection on bristle number variation in Dichaet, a mutated strain of the fruit fly. The study is part of a larger series of experiments aimed at understanding the relative influence of genetic inheritance and environmental factors on observable characteristics in the fruit fly. The author explores whether the variation is due to modification of the mutant gene itself or to the influence of multiple factors, as suggested by the multiple-factor view of inheritance. The primary conclusion of the book is that selection operates by isolating existing genetic variations rather than creating new variations, supporting the multiple-factor view of variation and inheritance. This book provides compelling evidence for the stability of genes, challenging the hypothesis that genes are easily contaminated in heterozygotes and mutate frequently. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Nº de ref. del artículo: 9781332298327_0
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An Analysis of the Effects of Selection Classic Reprint
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PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000. Nº de ref. del artículo: LW-9781332298327
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An Analysis of the Effects of Selection Classic Reprint
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PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000. Nº de ref. del artículo: LW-9781332298327
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