. The biology of the protozoa. Protozoa; Protozoa. k m& Mm THREE SOMATIC DIVISIONS OF FERTILIZED NUCLEUS FERTILIZATION TWO CONSECUTIVE DIVISIONS GIVING FOUR NORMAL CELLS. Fig. 139.—Paramecium caudatum. Diagram of the fertilization processes. (After Calkins.) There are two fundamental biological problems associated with the formation and fusion of gametes. These are: (1) The expla- nation of the origin of gametic differences, and (2) explanation of the phenomenon of attraction of gametes followed by their tem- 18. Please note that these images are extracted from scanned page images that
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. The biology of the protozoa. Protozoa; Protozoa. k m& Mm THREE SOMATIC DIVISIONS OF FERTILIZED NUCLEUS FERTILIZATION TWO CONSECUTIVE DIVISIONS GIVING FOUR NORMAL CELLS. Fig. 139.—Paramecium caudatum. Diagram of the fertilization processes. (After Calkins.) There are two fundamental biological problems associated with the formation and fusion of gametes. These are: (1) The expla- nation of the origin of gametic differences, and (2) explanation of the phenomenon of attraction of gametes followed by their tem- 18. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger