SPERMATOGENESIS 



Since in the testis tetrads occur only in the primary spermatocytes, 

 the cells shown in Fig. 20, G-J, are easily identified. These are success- 



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FIG. 20. SPERMATOGENESIS IN Dissosteira Carolina A-FX 1450; G-LX966. (Davis.) 



A, B, C, propbase, metaphase, and telophase of a spermatogonial division. D-L, successive stages in the 



division of a primary spermatocyte into secondary spermatocytes. 



i ve stages in the division of the primary spermatocyte. In G the accessory 

 chromosome is seen as a rod-shaped body above and to the right; in H it is 

 below and to the right. In J it is obliquely placed just above the equatorial 



