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CHAPTER 32 



32.1/. What do genes actuall) do? Has your answer am hearing upon the concept of 

 a gene? Explain 



32. IS. Is it proper to use the term, allele, to describe functional genetic units rather 

 than recombinational genetic units? Explain. 



32.19. What conclusions can you draw from the observation that most of the amino 

 acid substitutions involved in abnormal hemoglobins appear to lie on the sur- 

 face rather than in the interior of the fully-folded hemoglobin molecule? 



32.20. How do you interpret the finding that during hemoglobin synthesis, short-term 

 exposures to the isotope Fe 59 reveal its incorporation into Hb-A and Hb-A L . but 

 not into Hb-A ;i ? 



32.21. As indicated by arrows in the upper row of the accompanying diagram, trans- 

 plantation of eye anlage (imaginal discs) between D. melanogaster larvae pure 

 for dull-red ( + ) or bright-red — vermillion (v) or cinnabar (en) — eye color 

 genes produces adults with the eye colors indicated in the lower row. From 

 these results what can you conclude about the biochemical reactions leading to 

 the production of brown eye color pigment? 



