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Cytogenetic analysis and breakpoint distribution of radiation-induced interchanges in Hylemya antiqua Meigen

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Abstract

Over seventy chromosomal rearrangements have been isolated in the onion fly Hylemya antiqua with X-rays and fast neutrons on the basis of reduced fertility measurements and cytological analysis. Most rearrangements were asymmetrical reciprocal translocations, a few were triple translocations and one quadruple was observed. Two pericentric inversions were established. Both the meiotic and somatic pairing configurations were utilized. In seven out of 42 asymmetric translocations ‘duplication’ larvae were observed carrying a large duplication and a small deficiency resulting in a significantly higher egg hatch. The presence of such karyotypes can be disadvantageous for the genetic control of insect pests where the larval stage does the damage.

Relatively more breakpoints were established in chromosomes 2 and 6. It could be concluded from sib-crosses of reciprocal translocations in the onion fly that homozygotes can be produced without the use of morphological markers. The cytological analysis of adults following the assessment of extra reduced fertility compared to the testcross fertility is essential for the isolation of translocation homozygous individuals.

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Van Heemert, C., Robinson, A.S. Cytogenetic analysis and breakpoint distribution of radiation-induced interchanges in Hylemya antiqua Meigen. Genetica 57, 153–160 (1981). https://doi.org/10.1007/BF00131241

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