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No evidence of predation causing female-biased sex ratios in marine pelagic copepods
(Oldendorf, 2013-12-12)
Although sex ratios close to unity are expected in dioecious species, biased sex ratios are common in nature. It is essential to understand causes of skewed sex ratios in situ, as they can lead to mate limitation and have ...
Sex and neo-sex chromosomes in Orthoptera: a review
(Orthopterists' Society, 2010-12)
We review historical and pioneering work as well as recently published papers about orthopteran sex chromosomes and neo-sex mechanisms, highlighting Michael White's significant contributions. Meiotic research in Orthoptera ...
Morphologically differentiated sex chromosomes in neotropical freshwater fish
(2001-12-01)
A general survey of the occurrence of morphologically differentiated sex chromosomes in the neotropical freshwater fishes is presented. The total number of 32 occurrences involving simple XX-XY and ZZ-ZW, and multiple ...
The contrasting role of heterochromatin in the differentiation of sex chromosomes: an overview from Neotropical fishes
(WILEY-BLACKWELLMALDEN, 2012)
During the evolutionary process of the sex chromosomes, a general principle that arises is that cessation or a partial restriction of recombination between the sex chromosome pair is necessary. Data from phylogenetically ...
Screening and characterization of sex-specific DNA fragments in the freshwater fish matrinch, Brycon amazonicus (Teleostei: Characiformes: Characidae)
(Springer, 2012-10-01)
The matrinch Brycon amazonicus, a commercially important freshwater fish resource, has no heteromorphic sex chromosomes so far described. In the present study, we performed a screening of sex-associated DNA markers in this ...
MHM assay: molecular sexing based on the sex-specific methylation pattern of the MHM region in chickens
(SPRINGER, 2008)
Bird sex determination using molecular methods has proved to be a valuable tool in different studies. Although it is possible to sex most birds by coupling the CHD assay with others available methods, no sex-determining ...
Female-biased sex ratios in marine pelagic copepods: Response to Hirst et al. (2013)
(Oldendorf, 2013-12-12)
Hirst et al. (2013; Mar Ecol Prog Ser 489:297-298) suggest that Gusmão et al. (2013; Mar Ecol Prog Ser 482:279-298) misinterpreted the findings of Hirst et al. (2010; Limnol Oceanogr 55:2193-2206). They restate that the ...
Neo-sex chromosomes of Ronderosia bergi: insight into the evolution of sex chromosomes in grasshoppers
(Springer-Verlag Berlin Heidelberg, 2015)
Sex chromosomes have evolved many times from morphologically identical autosome pairs, most often presenting several recombination suppression events, followed by accumulation of repetitive DNA sequences. In Orthoptera, ...
Heteromorphic Sex Chromosomes and Their DNA Content in Fish: An Insight through Satellite DNA Accumulation in Megaleporinus elongatus
(Karger, 2020-04-01)
The repetitive DNA content of fish sex chromosomes provides valuable insights into specificities and patterns of their genetic sex determination systems. In this study, we revealed the genomic satellite DNA (satDNA) content ...
Population dynamics, relative growth and sex change of the protandric simultaneous hermaphrodite Exhippolysmata oplophoroides (Caridea: Lysmatidae) close to an upwelling area
(2018-06-01)
The present study investigated the population dynamics of Exhippolysmata oplophoroides in an area influenced by upwelling, focusing on reproductive period, sex ratio, growth rate, longevity, mortality, relative growth and ...