Results 11 to 20 of about 8,045,025 (304)
The evolutionary process of mammalian sex determination genes focusing on marsupial SRYs [PDF]
BMC Evolutionary Biology, 2018 Maleness in mammals is genetically determined by the Y chromosome. On the Y chromosome SRY is known as the mammalian male-determining gene. Both placental mammals (Eutheria) and marsupial mammals (Metatheria) have SRY genes. However, only eutherian SRY genes have been empirically examined by functional analyses, and the involvement of marsupial SRY in ...
Yukako Katsura +4 more
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Evidence for avian cell autonomous sex identity (CASI) and implications for the sex-determination process? [PDF]
Chromosome Research, 2011 For the majority of animals, males and females are obviously different in terms of appearance, behaviour and physiology, and until recently, these differences were considered to be the result of hormone actions. However, there is now considerable evidence that the development of some sexually dimorphic structures/behaviours is a function of properties ...
Clinton, M +3 more
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Sex determination in mammalian germ cells
Asian Journal of Andrology, 2015 Germ cells are the precursors of the sperm and oocytes and hence are critical for survival of the species. In mammals, they are specified during fetal life, migrate to the developing gonads and then undergo a critical period during which they are ...
Cassy M Spiller, Josephine Bowles
doaj +1 more source
Caste-biased Expression of fem and Amdsx Genes in Apis mellifera ligustica (Hymenoptera: Apidae)
Sociobiology, 2021 Sex determination and caste differentiation are two crucial processes for morphology building in honeybees. It is unclear whether there is an interaction between these two processes.
Lu-Xia Pan, Fu-Ping Cheng, Zi-Long Wang
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Sex Determination Using Mastoid Process Measurements in Brazilian Skulls [PDF]
International Journal of Morphology, 2008 Las caracteristicas del proceso mastoides son de gran utilidad para el diagnostico del sexo. De Paiva & Segre (2003) describieron que era posible el diagnostico del sexo, en base a la determinacion del area del triangulo formado entre los puntos porion, mastoidale y asterion.
Suazo Galdames, Iván Claudio +2 more
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Sex determination in honeybees: two separate mechanisms induce and maintain the female pathway. [PDF]
PLoS Biology, 2009 Organisms have evolved a bewildering diversity of mechanisms to generate the two sexes. The honeybee (Apis mellifera) employs an interesting system in which sex is determined by heterozygosity at a single locus (the Sex Determination Locus) harbouring ...
Tanja Gempe +5 more
doaj +1 more source
Ecology and Evolution, 2023 Understanding genome‐wide responses to environmental conditions during embryogenesis is essential for discerning the evolution of developmental plasticity and canalization, two processes generating phenotypic variation targeted by natural selection. Here,
Thea B. Gessler +2 more
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Sex determination using mastoid process
Asian Journal of Medical Sciences, 2015 Objective: Osteometric studies using individual bones have been a topic of interest among researchers. Such researches are a tool for conducting studies related to evolution, demographic profiles and forensic sciences. Skull is important in this regard as it resists adverse environmental conditions over time.
Priyanka Sinha +5 more
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Cortisol-induced masculinization: does thermal stress affect gonadal fate in pejerrey, a teleost fish with temperature-dependent sex determination? [PDF]
PLoS ONE, 2009 BACKGROUND: Gonadal fate in many reptiles, fish, and amphibians is modulated by the temperature experienced during a critical period early in life (temperature-dependent sex determination; TSD).
Ricardo S Hattori +9 more
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Conflict over condition-dependent sex allocation can lead to mixed sex-determination systems [PDF]
, 2014 Theory suggests that genetic conflicts drive turnovers between sex-determining mechanisms, yet these studies only apply to cases where sex allocation is independent of environment or condition.
Kuijper, B +3 more
core +2 more sources