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Meiotic segregation of compound-3 chromosomes in Drosophila

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Abstract

Analysis of crossos between genetically marked stocks of Drosophila melanogaster showed, that the compound-3 chromosomes C(3L)RM and C(3R)RM segregate preterentially in female meiosis, and the following two types of eggs are formed predominantly: C(3L)RM; 0 and 0; C(3R)RM. In male meiosis segregation is almost random and four types of sperm are formed: 1. C(3L)RM; C(3R)RM, 2. 0; 0, 3. C(3L)RM; 0, 4. 0; C(3R)RM. The frequencies of these sperm types vary with the genotypes tested. In the stock C(3L)RM, st; C(3R)RM, p p, males produce 76.8% type 1 and 2, and 23.2% type 3 and 4; males of the stock C(3L)RM, ri; C(3R)RM, sr form 63.2% type 1 and 2, and 36.8% type 3 and 4.

The segregational behaviour of compound-3 chromosomes found in female meiosis is expected according to the distributive pairing hypothesis. In the male however, where there is no distributive pairing, the stock-specific segregation of compound-3 chromosomes may be due to the presence of small homologous chromosome segments near the centromere which influence chromosome distribution.

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  1. Department of Zoology, Swiss Federal Instituto of Technology, Zürich, Switzerland

    H. U. Lütolf

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  1. H. U. Lütolf
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Lütolf, H.U. Meiotic segregation of compound-3 chromosomes in Drosophila . Genetica 43, 431–442 (1972). https://doi.org/10.1007/BF00156138

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  • DOI: https://doi.org/10.1007/BF00156138

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