Independent Recombination by Nonalleles 



47 



Pole—— Metaphase I— ■- Pol< 



CASE A 

 No chiasma 



II 



CASE B 

 After one 

 chiasma "^ 



in one pair 



or 



II 



Haploid Meiotic 

 Products at 

 Telophase II 



AB, AB, ab, ab 



Ab, Ab, aB, aB 



AB, Ab, aB, ab 



Ab, AB, ab, aB 



CASE C AB, ab, AB, ab 



After one J { \\ orA b, aB ' AB, ab 



chiasma fl I or A B, ab, Ab, aB 



in each pair or Bl Ub Bl Ub orAb, aB, Ab, aB 



Ab, aB, Ab, aB 

 orAB, ab, Ab, aB 

 orAb, aB, AB, ab 

 orAB, ab, AB, ab 



figure 4-7. Meiotic fate of gene pairs presumably located in nonhomologous pairs of 

 chromosomes. Note that when all alternatives in Case CI (and 11) are considered 

 AB - ab Ab = aB. 



