218 Miscellaneoits Linkage Topics 



4. By diagrams, show the sixty-four possible chromatids when three 

 chiasmata form between two genes. Tabulate noncrossovers, single, 

 double, and triple crossovers. 



5. Show that, by applying the binomial theorem, the number of non- 

 crossover, single crossover, etc., chromatids may be easily calculated no 

 matter how many chiasmata form between two genes. 



