Reports

Chromosome Number of a Small Protist: Accurate Determination

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Science  05 Dec 1969:
Vol. 166, Issue 3910, pp. 1289-1291
DOI: 10.1126/science.166.3910.1289

Abstract

Electron micrographs of serial sections through a meiotic prophase nucleus of the mycetozoan Labyrinthula sp. show that there are nine separate and distinct synaptinemal complexes. Since each complex represents a set of paired homologous chromosomes, it follows that the haploid chromosome number of this protist is nine.