The cell in development and inheritance . \—I. Fig. 113. — Conjugation oi Spirogyt a. [Overton.]A. Union of the conjugating cells (5. communis). B. The typical, though not invariable,mode of fusion in 6. Weberi; the chromatophore of the female cell breaks in the middle,while that of the male cell passes into the interval. C. The resulting zygospore filled withpyrenoids, before union of the nuclei. D. Zygospore after fusion of the nuclei and formationof the membrane. process to the fertilization and subsequent cleavage of the ovum isparticularly striking. The conjugation of unicellular plants s
The cell in development and inheritance . \—I. Fig. 113. — Conjugation oi Spirogyt a. [Overton.]A. Union of the conjugating cells (5. communis). B. The typical, though not invariable,mode of fusion in 6. Weberi; the chromatophore of the female cell breaks in the middle,while that of the male cell passes into the interval. C. The resulting zygospore filled withpyrenoids, before union of the nuclei. D. Zygospore after fusion of the nuclei and formationof the membrane. process to the fertilization and subsequent cleavage of the ovum isparticularly striking. The conjugation of unicellular plants shows some interestingfeatures. Here the conjugating cells completely fuse to form azygospore (Figs. 113, 140), which as a rule becomes surroundedby a thick membrane, and, unlike the animal conjugate, may longremain in a quiescent state before division. Not only do the nuclei SUMMARY AND CONCLUSION 229 unite, but in many cases the plastids also (chromatophores). InSpirogyra some interesting variations in this regard have been ob-served. In s
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