Studies in Spermatogenesis ...: A comparative study of the heterochromosomes in certain species of Coleoptera, Hemiptera and Lepidoptera, with especial reference to sex determinationCarnegie Institution of Washington, 1906 |
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19 chromosomes a₁ accessory anaphase Anasa Aphrophora quadrangularis bouquet stage Carabida Chelymorpha argus chro chromatin nucleolus Coccinellida Coptocycla cysts daughter plates deeply staining dumb-bell egg follicle elongated equal pair equatorial plates Family Chrysomelidae germ cells growth stages figs Hemiptera Hemiptera heteroptera Hemiptera homoptera hetero heterochro heterochromosome group heterochromosome pair heteroptera idiochromosomes iron-hæmatoxylin large chromosomes large plasmosome larger heterochromosome larvæ LEPIDOPTERA m-chromosomes maturation mitosis metaphase mitosis mosomes number of chromosomes odd chromosome Odontota dorsalis oöcytes oögonia ordinary chromosomes Orthoptera pair of chromosomes pair of heterochromosomes plate of spermatogonium plates from egg prophase safranin-gentian preparation Second spermatocyte sex characters sex chromosome sex determination showing metakinesis showing the heterochromosome shown in figure small chromosome small heterochromosome smaller somatic cells somatic number species of Coleoptera sperm head sperma spermatids spermato spermatocyte spindle spermatogenesis spermatozoa spireme stage STEVENS synapsis stage synizesis stage telophase Tenebrio molitor tetrads Trirhabda virgata unequal pair Zoöl