Heredity and sex . Fig. 6. — Chromatin diininution and origin of the germ-cells in Ascaris.(After Boveri.) THE EVOLUTION OF SEX 21 first sight the most natural interpretation. It might besaid, indeed, that they are among the first cells todifferentiate, but only in the sense that they specialize,as Fig. 7. — Origin of germ-ceils in Sagitta. (FromKorschelt and Heider.) In a parasitic worm, ascaris, one of the first fourcells divides differently from the other three cells. Asseen in Fig. 6, this cell retains at its division all of itschromatin material, while in the other three cell
Heredity and sex . Fig. 6. — Chromatin diininution and origin of the germ-cells in Ascaris.(After Boveri.) THE EVOLUTION OF SEX 21 first sight the most natural interpretation. It might besaid, indeed, that they are among the first cells todifferentiate, but only in the sense that they specialize,as Fig. 7. — Origin of germ-ceils in Sagitta. (FromKorschelt and Heider.) In a parasitic worm, ascaris, one of the first fourcells divides differently from the other three cells. Asseen in Fig. 6, this cell retains at its division all of itschromatin material, while in the other three cells someof the chromatin is thrown out into the cell-plasm. The /#^
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
