Crossing Over and Chiasma 



123 



t 



TWO HAPLOID NUCLEI 



DIPLOID NUCLEUS 



O 

 J 



DIPLOID NUCLEUS 



FIRST 



MEIOTIC DIVISION 



SECOND 

 MEIOTIC DIVISION 



MITOTIC DIVISION AND ir^ 

 SPORE FORMATION liSj 



FIGURE 16-7 {Above). Meiosis in Neurospora. 



FIGURE 16-8 (Riglit). Cliiasma and crossing 

 over in Neurospora. 



DIPLOID NUCLEUS 



¥ 



I 



^ 



DIPLONEMA 



t 



^ AFTER 



FIRST DIVISION 



+ + 



3 FOUR 

 MEIOTIC 

 PRODUCTS 



EIGHT SPORES 



