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• W2034477837 abstract "1. The haploid chromosome number in Agrostis nebulosa is seven. 2. In most instances seven typical bivalents appear in diakinesis, the chromosomes of each pair being connected by two terminalized chiasmata. In a few instances two or three bivalents are joined end to end in a chain; or three bivalents are joined at their ends at a common point (tri-association); both types may occur in the same nucleus. Occasionally univalents and fragments are found. 3. Each diplotene strand is clearly double, the pairing in most cases being complete along the entire length. In a few nuclei observed in diplotene, two bivalent threads were regularly paired on both sides of the median spindle fiber attachment except for a very short portion at one end. The free ends of one diplotene thread were conjugated with the free ends of the other. Such a condition might be expected to lead to a chain of two bivalents in diakinesis. In one nucleus three bivalent strands with free ends were seen so arranged as to produce in diakinesis a tri-association. 4. Interstitial chiasmata usually terminalize in typical and catenated bivalents on both sides of the spindle fiber attachment. In a few catenated bivalents complete terminalization was not attained. In no case observed was there an open ring of four or more chromosomes in diakinesis in consequence of terminalized chiasmata. 5. It is suggested that a small terminal portion of one chromosome in each of two or three pairs found in a chain has undergone reciprocal translocation, and the extreme end of one chromosome in each of three other bivalents found in a tri-association has undergone a three-way translocation. 6. Laterally attached fragments seen in somatic and homoeotypic divisions are probably constant features of these chromosomes, and may bear some relationship to the translocations here suggested. 7. No appreciable abortion of pollen grains was found." @default.
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• W2034477837 date "1936-06-01" @default.
• W2034477837 modified "2023-10-14" @default.
• W2034477837 title "Chromosome Behavior in Agrostis nebulosa" @default.
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• W2034477837 doi "https://doi.org/10.1086/334606" @default.
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