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Meiotic disjunction, sex-determination and embryonic lethality in an X-linked “Simple” translocation of the onion fly, Hylemya antiqua (Meigen)

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Abstract

It was shown that the translocation in study is X-linked. After testcrossing translocation heterozygous males they generally only produce translocation heterozygous daughters and normal sons. The small acrocentric chromosomes involved in the translocation appeared to be the sex-chromosomes. The X-chromosome has a secondary constriction which is missing in the (male determining) Y-chromosome. Meiotic orientation was studied in translocation heterozygous males and females. The alternate and adjacent I orientations were found in about equal frequencies. Further, numerical meiotic non-disjunction (two types) occurred in translocation heterozygous males (about 2%), but is much higher in females (18.7%). In (achiasmate) males the homologous centromeres predominantly regulate meiotic pairing, coorientation and disjunction, apparently independently of the chromosomal rearrangement. Disturbed telomere pairing in particular leading to reduced chiasma frequency most probably explains the high numerical non-disjunction in chiasmate females. A rather good relationship exists between the percentage “semi”-sterility (28%), scored as late embryonic lethals (eggs, 72 hrs.) and the percentage karyotypes (20%) in young eggs (8–16 hrs.) with a large chromosomal deficiency. The remaining sterility (8%) can be explained by the somewhat decreased viability of tertiary trisomics and duplication karyotypes at the end of the egg stage. This translocation behaves like a “simple” one.

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This paper precedes a second one (van Heemert, 1974) about different trisomic types derived from translocation heterozygous parents. There the same aspects as presented here will be discussed.

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van Heemert, C. Meiotic disjunction, sex-determination and embryonic lethality in an X-linked “Simple” translocation of the onion fly, Hylemya antiqua (Meigen). Chromosoma 47, 45–60 (1974). https://doi.org/10.1007/BF00326270

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  • DOI: https://doi.org/10.1007/BF00326270

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