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註釋Chromosomes and heredity. Chromosome structure. The sex chromosomes: heteropycnosis and its bearing on some general questions of chromosome behavior. Chromosomal interchanges. Chromosomal differences between races and species of drosophila. Evolution of the germplasm. Cytology and genetics of protozoa. Heredity status of the rhizopods. Nuclear behavior and reproduction in ciliated protozoa. Inheritance in ciliated protozoa. Physiology of the nucleus. The chromosomes of the amphibian nucleus. Radiation and the cell nucleus.