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Mostrando ítems 11-20 de 1897
Kinetic activity of the sex chromosomes of Mormidea paupercula (Pentatomidae, Heteroptera)
(Czech Academy of Sciences, 2010-07)
InMormidea paupercula (n = 6 + XY in males), the presence of a CMA3-bright band in the telomeric regions on both sexchromosomes allowed the analysis of the kinetic activity of the sex univalents and XY pseudobivalent at ...
Tracking the evolution of sex chromosome systems in Melanoplinae grasshoppers through chromosomal mapping of repetitive DNA sequences
(BioMed Central, 2013-08)
Background: The accumulation of repetitive DNA during sex chromosome differentiation is a common feature of many eukaryotes and becomes more evident after recombination has been restricted or abolished. The accumulated ...
Field sexing techniques for Fiordland crested penguins (tawaki; Eudyptes pachyrhynchus)
(The Ornithological Society of New Zealand, 2021-09)
Fiordland crested penguins (tawaki; Eudyptes pachyrhynchus) lack sexually dimorphic plumage so behavioural cues or bill size have traditionally been used to determine sex in the field. We aimed to identify morphological ...
Estradiol-dependent axogenesis and Ngn3 expression are determined by XY sex chromosome complement in hypothalamic neurons
(Nature Research, 2020-12)
Hypothalamic neurons show sex differences in neuritogenesis, female neurons have longer axons and higher levels of the neuritogenic factor neurogenin 3 (Ngn3) than male neurons in vitro. Moreover, the effect of 17-β-estradiol ...
Sexualidad y escuela : perspectivas programáticas posibles
(Universidad de San Andrés. Escuela de Educación, 2013)
Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
(Springer, 2010-12)
One of the main goals of sex allocation theory is understanding sex ratio evolution. However, theoretical studies predicting sex ratios in species with unusual sexual systems, such as protandric simultaneous (PS) ...
Neo-sex chromosome diversity in Neotropical melanopline grasshoppers (Melanoplinae, Acrididae)
(Springer, 2010-04)
We report the results of a study on the neo-sex chromosome systems of six Neotropical Melanoplinae species for contributing to a better understanding of their origin and behaviour of these systems. Our analyses included ...
Activation of stress response axis as a key process in environment-induced sex plasticity in fish
(Birkhauser Verlag Ag, 2020-11)
The determination of sex is an important hallmark in the life cycle of organisms, in which the fate of gonads and then the individual sex are defined. In gonochoristic teleost fish, this process is characterized by a high ...
Field Sexing Olrog´s Gull (Larus atlanticus) Using Morphometry
(Waterbird Society, 2018-12)
Olrog's Gull (Larus atlanticus) is a vulnerable species; however, no study has addressed the relationship between body measurements and sex. To provide an easy and reliable work tool to identify the sex of individuals, ...
A cheap and quick method for DNA-based sexing of birds
(Waterbird Society, 2008-09)
Although the collection of air-dried blood samples on filter paper has been used for field work as a routine, it has required the use of special and expensive types of paper. In the present manuscript the use of common ...