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112. Redfield, H. A comparison of triploid and diploid crossing over for chromo- 

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113. Rhoade-s, M. M. a new type of translocation in Drosophila melanogaster. 

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114. Robertson, W. R. B. A permanent chromosomal translocation induced by 

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115. ScHULTZ, J. X-ray eflfects on Drosophila pseudoobscura. Genetics 18: 284- 

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116. ScHULTz, J., and Th. Dobzhansky. The relation of a dominant eye color in 

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117. Serebrovsky, a. S. A general scheme for the origin of mutations. Anat. 

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118. Serebrovsky, A. S. Studies on the step-allelomorphism. IV. Jour. Exp. 

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119. Serebrovsky, A. S., and N. P. Dubinin. X-ray experiments with Drosophila. 

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120. Serebrovsky, A. S., N. P. Dubinin, I. I. Agol, W. N. Slibpkoff, and W. E. 

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121. Shapiro, N. I. Step-allelomorphism in Drosophila melanogaster. VII. Jour. 

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122. Shapiro, N. I. The influence of the age of germ cells on (he origin of trans- 

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123. SiDOROV, B. N. A new allelomorph of bobbed connected with a translocation 

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124. Sivertzev-Dobzhansky, N. P., and Th. Dobzhansky. Deficiency and duplica- 

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125. Snell, G. D. Genetic changes in mice induced by X-rays. Amer. Nat. 67 : 81. 

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126. Stern, C. Eine neue Chromosomenaberration von Drosophila melanogaster 

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127. Stern, C. Untersuchungen iiber Aberrationen des Y-Chromosoms von Droso- 

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128. Stern, C. Zytologisch-genetische Untersuchungen als Beweise fiir die Mor- 

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130. Sturtevant, a. H. The effect of unequal crossing-over at the Bar locus in 

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