Exploring the evolution of environmental sex determination especially in reptiles in St. John

Peichel C. Lemos B. Olmo E. Here, we review the current knowledge on the evolution of sex chromosomes in lizards and discuss how sex chromosome evolution within that group differs from other amniote taxa, facilitating unique evolutionary pathways.

Although not all species have been subjected to systematic incubation experiments to identify cases of TSD, it has been likely that all crocodiles 25 speciesmarine turtles seven speciesand tuatara one speciesand several freshwater turtles and tortoises 49 of species and many lizards 45 of species have TSD.

Instances of such fusions have been found in a number of lizard families Gekkonidae e. Please review our privacy policy.

It is generally accepted that heteromorphic sex chromosomes originate from an autosomal ancestor following mutational acquisition of a sex determining allele [ 2313435363738 ]. Sex Chromosomes and Sex-Linked Genes. Moreover, in some species, like the Australian bearded dragon exploring the evolution of environmental sex determination especially in reptiles in St.

John Pogona vitticeps [ 171819 ], genes on the sex chromosomes interact with the incubation environment to determine sex. Temperature-Dependent Sex Determination in Lizards Unlike other amniotes, the class reptilia is the only vertebrate group where both GSD and TSD have been described species examined and where there is evidence of frequent evolutionary transitions between these two modes Figure 1 [ 121462 ].

Multiple Origin, Rapid Transitions and Turnovers Sex determination in amniotes shows a sharp contrast between the extraordinary conservation of mammals and birds and the astonishing lability of reptiles [ 62 ].

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Temperature-Dependent Sex Determination in Vertebrates. Holleley C. Female meiosis drives karyotypic evolution in mammals. The origin and evolution of parthenogenesis in Heteronotia binoei Gekkonidae : Genetic diversity among bisexual populations.

Although not all species have been subjected to systematic incubation experiments to identify cases of TSD, it has been likely that all crocodiles 25 speciesmarine turtles seven speciesand tuatara one speciesand several freshwater turtles and tortoises 49 of species and many lizards 45 of species have TSD.

The diversity of sex determining mechanisms in the ectothermic reptiles, compared to that of the homeothermic birds and mammals, and amphibians and fish typically poikilothermicmay have arisen because of a unique predisposition to the development of TSD, acting as an intermediary in the evolution of GSD in its various forms [ 83 exploring the evolution of environmental sex determination especially in reptiles in St.

John.

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  • Reproductive and Developmental Strategies pp Cite as. The TSD system is where sex is established by the incubation temperature during a critical stage of embryonic development.
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Sex-chromosome evolution: Recent progress and the influence of male and female heterogamety. In contrast to the conservative nature of mammals and bird sex chromosomes, many reptiles exhibit remarkable variation in the sex chromosome pair, and in the system of heterogamety, sometimes even among closely related species or even within populations [ 6 , 12 , 31 ].

Open in a separate window. Early origin of viviparity and multiple reversions to oviparity in squamate reptiles. Reticulate evolution of the rock lizards: Meiotic chromosome dynamics and spermatogenesis in diploid and triploid males of the genus Darevskia.

Wibbels T.

Exploring the evolution of environmental sex determination especially in reptiles in St. John

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