Journal of experimental zoology . ?«*iO»r5W5»r5»Oif3io»0 Fig. 3G Aeshna canadensis; frequency distribution of head-lengths of 49Gspermatozoa from the right testis. Value in 42 9 44 48 50 53 44 23 54 1 15 7 4 2 3 1 30 33 20. 8 Fig. 37 Rana pipiens; frequency distribution of head-lengths of 494 sper-matozoa from a single testis. Value in /z
Journal of experimental zoology . ?«*iO»r5W5»r5»Oif3io»0 Fig. 3G Aeshna canadensis; frequency distribution of head-lengths of 49Gspermatozoa from the right testis. Value in 42 9 44 48 50 53 44 23 54 1 15 7 4 2 3 1 30 33 20. 8 Fig. 37 Rana pipiens; frequency distribution of head-lengths of 494 sper-matozoa from a single testis. Value in /z Frequency 3 2 4 9 16 25 35 48 44 49 69 54 44 28 23 228 19 12 ^ 3 SIZE DIMORPHISM IN SPERMATOZOA 229 (d) Conclusion, The existence of the bimodal condition inthis species can not be ascribed to any known chromosomaldifferences. 12. Pseudemys troosii (a) Spermatogenesis evidence concerning dimorphism. Thereis no description for this species but according to H. E. Jordan(14) several species of turtles have an accessory chromosome. (h) Material and method. Material obtained at Urbana,Ilhnois, November 8, 1913; motile in Ringers solution killed inBouins fluid; diagram of sperm-head in figure 10 k; measure-ments to quarters of a micrometer division in set A and to tenthsin set B. In set A one micrometer division equals ^ and ins
Size: 2083px × 1199px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
