. Cell heredity. Cytogenetics. NONCHROMOSOMAL GENES Autogamy. FIGURE Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next
. Cell heredity. Cytogenetics. NONCHROMOSOMAL GENES Autogamy. FIGURE Autogamy and conjugation in Paramecium. 1. Animals with one macronucleus and two micronuciei per cell. 2. Each micronucleus undergoes meiosis. Result: eight haploid nuclei. The macro- nucleus begins to degenerate. 3". Seven of the nuclei degenerate, and the eighth wilt divide. 4. In conjugating animals, one member of each pair of remaining nuclei is exchanged. 5. The haploid nuclei fuse to form the new diploid micronucleus, which divides twice, giving rise to two new macronuclei and two micronuciei. 6. At the next cell division, one macro- nucleus goes to each daughter cell, but the micronuciei divide again so that two are present in each 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 Sager, Ruth; Ryan, Francis J. (Francis Joseph), 1916-. New York, Wiley
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