Chromosome relationships and meiotic mechanisms of certain morsitans group tsetse flies and their hybrids

Southern, D. I.; Pell, P.E.

doi:10.1007/bf00291026

Cited by 37 publications

(17 citation statements)

References 9 publications

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“…In linkage group II of G.mmorsitans, Xo and Odh are separated by 44.8% recombination, Odh and Est-1 by 4% recombination, and Est-1 and Est-2 by 8% recombination . The recombination distances between these loci have not been determined in G.m.centrulis or in G.swynnertoni, but are thought to be similar to those in G.m.morsituns because chromosomes in the subspecies of G.morsituns are morphologically nearly identical and, in hybrids, autosomes and sex chromosomes form their bivalents normally and there are no mechanical difficulties during meiosis (Southern & Pell, 1973).…”

Section: Methodsmentioning

confidence: 97%

Genetics of hybridization of Glossina swynnertoni with Glossina morsitans morsitans and Glossina morsitans centralis

Gooding

1997

Medical Vet Entomology

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Reciprocal crosses were performed with Glossina swynnertoni and Glossina morsitans morsitans and with G.swynnertoni and Glossina morsitans centralis, using strains that carried marker genes in all three linkage groups. Glossina swynnertoni males can inseminate, but not fertilize, G.m.morsitans; all other crosses produced some fertile females. Hybridization did not cause sex ratio distortion among F1 flies. Most F1 and backcross females were fertile, but all F1 males were sterile. Sterility among backcross males was also high (99% in Bx1, 85% in Bx2, and about 50% in Bx3 to Bx5). Chromosome transmission by hybrid females usually conformed to Mendelian expectations, but genetic recombination was lower than observed in G.m.morsitans. The reduction in fertility among backcross females was not associated with heterozygosity in any linkage group. Sterility among hybrid and backcross males was associated with heterozygosity of sex chromosomes and probably autosomes. The results support the systematic placement of G.swynnertoni closer to G.m.centralis than to G.m.morsitans.

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Section: Methodsmentioning

confidence: 97%

Genetics of hybridization of Glossina swynnertoni with Glossina morsitans morsitans and Glossina morsitans centralis

Gooding

1997

Medical Vet Entomology

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“…The more important role of the X-than the Y-chromosome in causing the hybrid male sterility would not be expected from the cytogenetic studies of Southern and Pell (1973), which showed that the sub-species have visible differences between their Y-chromosomes, but not between their Xchromosomes.…”

Section: Discussior'mentioning

confidence: 98%

X-Chromosome involvement in male hybrid sterility from Glossina morsitans sub-species crosses

1980

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SUMMARYCrosses between sub-species of the tsetse fly Glossina morsitans yield males which can mate but are unable to inseminate. To test the hypothesis of Xchromosome involvement in this form of male sterility, G. m. morsitans carrying the X-chromosome marker ocra were mated to wild type G. m. centralis, and the F1 females backcrossed to each parental population. The ocra gene was used to distinguish those male progeny which had inherited their X-chromosomes from each sub-species and these categories of male from each backcross differed significantly in the proportion which could inseminate. It is concluded that inability to inseminate is caused by an interaction of the X-chromosome from one sub-species with the Y-chromosome and/or autosomal factors from the other. The results are discussed in relation to similar observations from crosses within two Anopheles species complexes and to the genetic control of tsetse flies.

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“…This suggests a certain parallelism between these two kinds of chromosomes. Of course, sex chromosomes may be the source of B chromosome origin, as suggested for the Y chromosome in the fly Glossina [Southern and Pell, 1973] and the W chromosome in the frog Leiopelma hochstetteri [Green, 1988]. In Glossina , similitude in meiotic behaviour seemed to point to B origin from the Y [Southern and Pell, 1973], but in situ hybridization analysis with repetitive DNAs showed a complex picture [Amos and Dover, 1981].…”

Section: Origin Of B Chromosomes From Sex Chromosomes and Vice Versamentioning

confidence: 99%

“…Of course, sex chromosomes may be the source of B chromosome origin, as suggested for the Y chromosome in the fly Glossina [Southern and Pell, 1973] and the W chromosome in the frog Leiopelma hochstetteri [Green, 1988]. In Glossina , similitude in meiotic behaviour seemed to point to B origin from the Y [Southern and Pell, 1973], but in situ hybridization analysis with repetitive DNAs showed a complex picture [Amos and Dover, 1981]. In L. hochstetteri , however, B derivation from the W chromosome was inferred after DNA sequence comparison [Sharbel et al, 1998], which offers much higher confidence in that conclusion.…”

Section: Origin Of B Chromosomes From Sex Chromosomes and Vice Versamentioning

confidence: 99%

B Chromosomes and Sex in Animals

Camacho

Schmid

Cabrero

2011

Sex Dev

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Supernumerary (B) chromosomes are dispensable elements found in many eukaryote genomes in addition to standard (A) chromosomes. In many respects, B chromosomes resemble sex chromosomes, so that a common ancestry for them has frequently been suggested. For instance, B chromosomes in grasshoppers, and other insects, show a pycnotic cycle of condensation-decondensation during meiosis remarkably similar to that of the X chromosome. In some cases, B chromosome size is even very similar to that of the X chromosome. These resemblances have led to suggest the X as the B ancestor in many cases. In addition, sex chromosome origin from B chromosomes has also been suggested. In this article, we review the existing evidence for both evolutionary pathways, as well as sex differences for B frequency at adult and embryo progeny levels, B chromosome effects or B chromosome transmission. In addition, we review cases found in the literature showing sex-ratio distortion associated with B chromosome presence, the most extreme case being the paternal sex ratio (PSR) chromosomes in some Hymenoptera. We finally analyse the possibility of B chromosome regularisation within the host genome and, as a consequence of it, whether B chromosomes can become regular members of the host genome.

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Chromosome relationships and meiotic mechanisms of certain morsitans group tsetse flies and their hybrids

Cited by 37 publications

References 9 publications

Genetics of hybridization of Glossina swynnertoni with Glossina morsitans morsitans and Glossina morsitans centralis

Genetics of hybridization of Glossina swynnertoni with Glossina morsitans morsitans and Glossina morsitans centralis

X-Chromosome involvement in male hybrid sterility from Glossina morsitans sub-species crosses

B Chromosomes and Sex in Animals

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