RECIPROCAL TRA NSLOCA TION 



333 



i 



B 



Fig. 1S9. — Chromosome complexes produced by reciprocal translocation. A, synaptic 

 complex formed by two normal and two reciprocally translocated chromosomes; cf. key 

 diagram {B) and Fig. 188. C, ring of four in diakinesis formed by opening out of synaptic 

 complex; cf. key diagram (D) and Fig. 188. A, X 900; C, X 1800. {From McClintock.) 



B 



3 

 t 



Fig. 190. — Formation of ring of six lay reciprocal translocation. The translocation 

 involves chromosomes 1 and 2 in race A, and chromosomes 2 and 3 in race B. In the hybrid 

 between A and B the six chromosomes tend to form a six-rayed synaptic complex in early 

 meiotic prophase and a ring of six at diakinesis. For easy interpretation one end of 

 each chromosome is marked with a knob. 



