Chiasma distribution in Truxaline grasshoppers

Southern, D. I.

doi:10.1007/bf00326727

Cited by 55 publications

(32 citation statements)

References 13 publications

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“…Henderson concluded from chiasma distribution patterns and the chiasma frequency/chromosome length relationship that chiasma formation was indeed sequential, but, on the grounds of the high distal chiasma frequency, he proposed that it proceeded towards the centromere. The same conclusion was drawn by Southern (1967), from his study of four Truxaline grasshopper species (the karyotype of which comprises three meta/ submetacentric and five telocentric pairs), and by Fox (1973), again in S. gregaria. However, Fox recognized that 'interference distance' was a misnomer, because interchiasma distance (ix) is determined not only by interference but by other factors as well.…”

Section: Introductionsupporting

confidence: 64%

“…melanogaster Mather (1936a) quoted Stevens (1936) as a watershed; Henderson (1963), Southern (1967) and Fox (1973) quoted Mather (1936aMather ( ,b, 1938Mather ( , 1940 and the whole subject was considered closed. Even quite recent discussions of interference unanimously take for granted that there is no interference across the centromere (King & Mortimer, 1990;Foss et a!., 1993;Munz, 1994).…”

Section: Genetic Approachmentioning

confidence: 99%

“…Southern (1967) studied chiasma distribution in four Truxaline species, C. brunneus, Myrmeleotettix maculatus, C. parallelus and Omocestus viridulus, with the aim of testing Mather's sequential model, by the same approach as Henderson (1963) but in species with bi-armed chromosomes. He concurred with Henderson's (1963) interpretation of sequential chiasma formation towards the centromere on the grounds of the high incidence of distal chiasmata.…”

Section: Genetic Approachmentioning

confidence: 99%

“…Recent years have seen a revival of interest in this question, with the emergence of several models for the operation of interference (King & Mortimer, 1990;Foss et aL, 1993;, many of which took for granted Mather's model (1938) and the slight modifications of his followers (especially Henderson, 1963;Southern, 1967 andFox, 1973). Given the renewed importance of this issue we considered it an opportune time to reassess critically the available evidence concerning interference.…”

Section: Introductionmentioning

confidence: 99%

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Chiasma interference is blind to centromeres

Colombo

Jones

1997

Heredity

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It has long been assumed, since the early works of Mather, that the centromere plays a central role in chiasma position determination, so much so that in all sequential models chiasma determination was supposed to start or finish at this point. More specifically, it has been asssumed that the centromere acts as a barrier to the transmission of interference, so that a chiasma in the vicinity of a centromere would not affect the probability of chiasma formation across this point. Some statistical analyses seemed to ratify this supposition. However, a reassessment of the literature led us to the conclusion that the statistical analyses that were not flawed were consistent in showing that interference may act across the centromere. Using large sets of chiasma data from the grasshoppers Lepysma argentina and Chorthippus brunneus and applying statistical approaches that involved either the calculation of coincidence or correlating the distances between the centromere and the nearest chiasma in either arm, it is concluded: 1 that interference acts across the centromere; 2 that the action of interference is not changed by the presence of an intervening centromere.

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Section: Introductionsupporting

confidence: 64%

Section: Genetic Approachmentioning

confidence: 99%

Section: Genetic Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chiasma interference is blind to centromeres

Colombo

Jones

1997

Heredity

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“…These meiotic timings were confirmed by analysis of the labelling patterns in experiment B. The standard karyotype of Chorthippus brunneus has been fully described elsewhere (John and Hewitt, 1966;Southern, 1967). In addition to a single allocyclic X chromosome, the male complement Consists of 16 autosomes.…”

Section: Results (A) !Vleiotic Timingmentioning

confidence: 66%