Studies in Spermatogenesis ...

19 large accessory chromosome anaphase appears archoplasmic Biol bivalent chromosomes Blattella germanica bouquet stage centrosome chro chromatin element chromatin nucleolus chromo Chrysomelida Coccinellida Coleoptera condensed conspicuous containing cysts daughter plates divides elongated equal pair equatorial plate Family Chrysomelida germ cells growth stages figs Hemiptera Hemiptera heteroptera hetero heterochromosome group heterochromosome pair heteroptera idiochromosomes iron-hæmatoxylin large chromosomes larger larvæ late anaphase later stage LEPIDOPTERA linin longitudinal split loops m-chromosomes male somatic cells maturation division maturation spindle McClung metaphase mosomes nuclear membrane nucleolus nucleus number of chromosomes odd chromosome oöcytes oögonia Orthoptera pair of heterochromosomes plate of spermatogonium polar plates prophase rest stage Sagitta Second spermatocyte segments sex characters sex determination shown in figures small chromosome somatic cells species of Coleoptera sperm head spermatids spermato spermatogenesis spermatozoa spindle figs spindle-remains spireme stage Stenopelmatus synapsis stage synizesis synizesis stage telophase Tenebrio molitor tetrads Trirhabda unequal pair unsymmetrical pair Young spermatid