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


Genetica 57(2): 154-160
Cytogenetic analysis and breakpoint distribution of radiation-induced interchanges in Hylemya antiqua Meigen
Over 70 chromosomal rearrangements have been isolated in Delia antiqua (Mg.) (Hylemya antiqua) with X-rays and fast neutrons, as determined by reduced fertility and cytological analysis. Most rearrangements were asymmetrical reciprocal translocations, a few were triple translocations and 1 quadruple was observed. Two pericentric inversions were established. Both the meiotic and somatic pairing configurations were used. In 7 of 42 asymmetric translocations, 'duplication' larvae were observed; these carried a large duplication and a small deficiency resulting in a significantly higher egghatch. The presence of such karyotypes can be disadvantageous for the genetic control of pests of which it is the larvae that cause the damage. The largest number of breakpoints were established in chromosomes 2 and 6. It could be concluded from sibling crosses of reciprocal translocations in D. antiqua 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 test-cross fertility is essential for the isolation of translocation homozygous individuals.

Accession: 000851310

DOI: 10.1007/bf00131241

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