PLATE V 



Meiosis in Triploids 



Figs, i and 2. — Zygotene, three chromosomes (running right and left 

 in both nuclei) pairing, early and late stage. Note that the chromosomes 

 are single threads and associate in pairs. Tulipa (D., 1931 b.) x ca. 1000. 



Fig. 3. — Fritillaria dasyphylla (3,^ = 36), showing univalent and 

 trivalent chromosomes from first metaphase to telophase. Flemming — 

 gentian-violet smear taken with 4 mm. objective. (La Cour and 

 Osterstock.) x ca. 500. 



