Abstract
Artificial Parthenogenesis and Chromosome Constitution AN extensive study of the effects of artificial parthenogenesis upon, the chromosome constitution of the cells resulting from the subsequent cleavages in the eggs of the frog Rana nigromaculata is reported by T. Kawamura (J. Sci. Hirosima Univ., Series B, 1939). In most instances the successive cleavages occurred at the normal times, but in about 18 per cent they were delayed. The histories of 1,073 eggs were followed and in 413 that lived longer than seven days the chromosome number was determined; 49 per cent of these were haploid, 21 per cent were diploid, 23 per cent were triploid. The remainder were divided among tetraploid, hexaploid, hyperploid, haploid-diploid, haploid-triploid, haploid-pentaploid and triploid-hexaploid. In each instance an attempt is made to explain how the particular condition originated. The most viable type is the diploid. Some of the external characters of the parthenogenetic larvæ are described. the paper is provided with numerous tables and illustrations of the various chromosome conditions.
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Research Items. Nature 144, 209–211 (1939). https://doi.org/10.1038/144209a0
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DOI: https://doi.org/10.1038/144209a0