. The biology of the protozoa. Protozoa; Protozoa. DERIVED ORGANIZATION 103 of the chromosomes, but in the coccidian Aggregate, eberthi where reduction is zygotic (the vegetative stages being haploid) the twelve chromosomes unite in six pairs of homologous chromosomes (Dobell) (Fig. 56) and a modified spireme occurs in the progamous divisions. Similar but less definite conditions are shown in the gregarine Diplocystis schieideri as described by Jameson (1920) (Fig. 158, p. 310). A somewhat simplified history of the chromatin was given by Mulsow (1911) for the progamete nucleus of the gregarine
. The biology of the protozoa. Protozoa; Protozoa. DERIVED ORGANIZATION 103 of the chromosomes, but in the coccidian Aggregate, eberthi where reduction is zygotic (the vegetative stages being haploid) the twelve chromosomes unite in six pairs of homologous chromosomes (Dobell) (Fig. 56) and a modified spireme occurs in the progamous divisions. Similar but less definite conditions are shown in the gregarine Diplocystis schieideri as described by Jameson (1920) (Fig. 158, p. 310). A somewhat simplified history of the chromatin was given by Mulsow (1911) for the progamete nucleus of the gregarine Monocystis rostrata (Fig. 55). Here, differing from Diplocystis, re- duction is gametic and the vegetative stages are diploid. The resting nucleus is vesicular and the chromatin granules join chain- wise to form eight chromosomes. These split lengthwise in the metaphase stage, a preliminary spireme stage, apparently, being 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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