Sex-dependent meiotic behaviour of B chromosomes in the grasshopper Eyprepocnemis plorans

Henriques‐Gil, Nuno; Cano, M I; Santos, Juan Luis

doi:10.1038/hdy.1989.31

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…Meiotic Behavior ofB Chromosomes During Oogenesis. -The three types of B chromosome analyzed in this paper show similar meiotic behavior during oogenesis, as has been noted by Henriques-Gil et al (1989). At metaphase I, B-univalents are 0.43 X 0.25 = 0.1075 0.565 X 0.25 = 0.14125 0.640 X 0.25 = 0.16 0.570 + (0.430 X 0.5) = 0.7850 0.435 + (0.565 X 0.5) = 0.7175 0.360 + (0.640 X 0.5) = 0.68 0.43 X 0.25 = 0.1075 0.565 X 0.25 = 0.14125 0.640 X 0.25 = 0.16 usually located at the plate and lag during anaphase I with respect to standard chromosomes.…”

Section: Meioticsupporting

confidence: 78%

“…One of the most complex cases known to date is that of the grasshopper Eyprepocnemis plorans, in which at least thirty variants of Bs have been described. This polymorphism has been dealt with in a number ofstudies concerning not only its geographic distribution (Camacho et al, 1980;Henriques-Gil et al, 1984a; Henriques-Gil and Arana, 1990) but also on the factors affecting meiotic behavior of supernumeraries in males (Henriques-Gil et al, 1984a) and females (Henriques-Gil et al, 1989), as well as chiasma frequency and distribution ofthe carriers (Henriques-Gil et al, 1982a. 1982bCano et al, 1986Cano et al, , 1987.…”

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confidence: 99%

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A Widespread B Chromosome Polymorphism Maintained Without Apparent Drive

et al. 1992

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The transmission rates of the three main types of B chromosome present in the grasshopper Eyprepocnemis plorans were studied by two different methods: (i) cytological observation of their meiotic behavior in males and females and (ii) karyological analysis of the embryo offspring obtained either from gravid females collected in the field or from controlled crosses. We conclude that Bs are inherited in a random manner with no tendency toward accumulation or loss from either sex. The possible factors that might be responsible for the maintenance of this widespread polymorphism are discussed.

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Section: Meioticsupporting

confidence: 78%

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confidence: 99%

A Widespread B Chromosome Polymorphism Maintained Without Apparent Drive

et al. 1992

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“…Sex-dependent meiotic behaviour of B chromosomes was found in the grasshopper Eyprepocnemis plorans (Henriques-Gil et al, 1989) although in this case the transmission of the B is not affected by sex (López-León etal., 1992).…”

Section: Methodsmentioning

confidence: 99%

Genetic control of the rate of transmission of rye B chromosomes. II. 0B × 2B crosses

et al. 1995

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Twenty 9 OB x d 2B crosses were made in which a single male was crossed with four different females, and the character 'mean number of Bs per plant in the progeny' was analysed. The 2B plants used as males and the OB females belonged either to low or to high transmission rate lines, previously selected. The genetic basis of the difference between the high and low transmission rate lines was statistically tested. The male group (high or low class of the 2B male) has a significant effect on the progeny, while the female group (high or low class of the 013 female) has no significant effect. The genes controlling the transmission rate of B chromosomes affect the proportion of OB vs. 2B plants in the OB X 2B cross, but this is not a result of any effect on the nondisjunction mechanism, since the proportion of lB plants is low in all cases. Structural variants of B chromosomes appeared de novo at a high frequency.

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“…The same author (1988) investigated the effects of Bchromosomes on meiosis of the grasshoppers Dichroplus pseudopunctulatus and Sinipta dalmani. Henriques-Gil et al (1989) noted accumulation of B-chromosomes in the gametes with X-chromosome in the examined males of E. plorans. Lopez- Leon et al (1996) found that B-chromosomes were more frequent in males than females in E. plorans.…”

Section: Introductionmentioning

confidence: 97%

New record of B-chromosome through meiosis in the Egyptian locust Anacridium aegyptium (Acrididae) with indication to its origin

Abd‐Elhaleem

Sharaf

El-Kabbany

2009

Journal of King Saud University - Science

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The basic chromosome complement of the Egyptian male locust, Anacridium aegyptium; collected from Giza Governorate, Egypt, is 2N = 22 + XO. All autosomes and sex chromosome are telocentric. The autosomes can be divided into three size-groups; three long (L 1 -L 3 ), five medium (M 4 -M 8 ) and three short chromosomes (S 9 -S 11 ). The X-member is the longest member of all chromosomes. An extra telocentric B-chromosome was detected in two males of the collected locusts, nearly equal in size with S 10 -member and thus the chromosome complement of these males is 2N = 22 + XO + B. The origin of this extra member is discussed through its behaviour through meiosis that studied. The B-chromosome was frequently observed neighbouring the X-chromosome through most of the meiotic stages and this behaviour reinforces the present suggested hypothesis that B-chromosome was originated from X-chromosome.

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Sex-dependent meiotic behaviour of B chromosomes in the grasshopper Eyprepocnemis plorans

Cited by 7 publications

References 16 publications

A Widespread B Chromosome Polymorphism Maintained Without Apparent Drive

A Widespread B Chromosome Polymorphism Maintained Without Apparent Drive

Genetic control of the rate of transmission of rye B chromosomes. II. 0B × 2B crosses

New record of B-chromosome through meiosis in the Egyptian locust Anacridium aegyptium (Acrididae) with indication to its origin

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