Bacteria: Recombination {II) 355 



38.4. In this Chapter, what is the evidence that the two auxotrophs which produced proto- 

 trophic progeny did so because of conjugation rather than because of mutation, 

 genetic transformation, or viral infection? 



38.5. In what ways does genetic transformation differ from conjugation? 



38.6. Invent suitable genotypes for parents, a zygote, and its clonal progeny, which would 

 prove the existence of the zygote, from the genotypes of the members of the clone it 

 produces. 



38.7. Ignoring the centromere, draw all the different ways you can represent a chromosome 

 whose recombination map is linear. 



38.8. Do you think the Summary and Conclusions section for this Chapter is adequate? 



Why? 



38.9. Do you suppose the discovery of sexuality in bacteria could have important implica- 

 tions for the practice of medicine? Why? 



38.10. What is meant by integration in genetics? Describe verbally the mechanisms by 

 which it may occur. 



38.11. List those features of crossing over which are difficult to explain on a copy-choice 

 basis. 



38.12. Discuss the genetic control of gene synthesis and gene degradation. 



38.13. Criticize the statement, on p. 16, that reconic transmission can only occur between 

 generations by means of a cellular bridge. 



