Phenotypic Effects of Gene Action 



81 



figure 6-10. Normal (right) and Creeper (left) homozygote at about 19 

 days of development. (Courtesy of L. C. Dunn; reprinted by permission of 

 McGraw-Hill Book Co., Inc., from Study Guide and Workbook for Genetics 

 by I. H. Herskowitz. Copyright, 1960.) 



figure 6-11. Normal (right) and Creeper (left) heterozygote embryos at 

 about 48 hours of development. (Courtesy of L. C. Dunn; reprinted by per- 

 mission of McGraw-Hill Book Co., Inc., from Study Guide and Workbook 

 for Genetics by I. H. Herskowitz. Copyright, I960.) 



