Adult Culex pipiens males irradiated with both X-rays and neutrons were crossed to untreated females and F1-egg rafts were checked for dominant lethality. F1-progenies were outcrossed with normal individuals in order to obtain lines with inherited semisterility. From a total of 120 lines that showed a certain amount of sterility 12 lines were studied cytologically. 10 lines showed reciprocal chromosome exchanges.—At late pachytene and diplotene cross configurations with large asynaptic regions at the center of the cross are obligatory. Bivalents, chains of three, chains of four, and ring configurations are present at metaphase and anaphase I. The different frequencies of the occurrence of such multiples are dependent on the chromosomes involved in the exchange, the length of the pairing segments and the chiasma frequencies in these segments. Chiasma frequency in the interstitial segments is reduced by means of chiasma interference over the centromere and by asynapsis near the breakage points. — Alternate, adjacent-1- and adjacent-2-distributions are present to a different extent. Alternate distribution is most, adjacent-2-distribution least frequent. — The role of translocations and the probability of their becoming effective in pest eradication programs is discussed.
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Jost, E., Laven, H. Meiosis in translocation heterozygotes in the mosquito Culex pipiens . Chromosoma 35, 184–205 (1971). https://doi.org/10.1007/BF00285736
- Developmental Biology
- Normal Individual
- Breakage Point
- Eradication Program
- Chiasma Frequency