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Did Lizards Follow Unique Pathways in Sex Chromosome Evolution?

Institute for Applied Ecology, University of Canberra, Canberra 2616, Australia
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Genes 2018, 9(5), 239; https://doi.org/10.3390/genes9050239
Received: 28 February 2018 / Revised: 26 April 2018 / Accepted: 26 April 2018 / Published: 3 May 2018
(This article belongs to the Special Issue Chromosomal Evolution)
Reptiles show remarkable diversity in modes of reproduction and sex determination, including high variation in the morphology of sex chromosomes, ranging from homomorphic to highly heteromorphic. Additionally, the co-existence of genotypic sex determination (GSD) and temperature-dependent sex determination (TSD) within and among sister clades makes this group an attractive model to study and understand the evolution of sex chromosomes. This is particularly so with Lizards (Order Squamata) which, among reptiles, show extraordinary morphological diversity. They also show no particular pattern of sex chromosome degeneration of the kind observed in mammals, birds and or even in snakes. We therefore speculate that sex determination sensu sex chromosome evolution is labile and rapid and largely follows independent trajectories within lizards. 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. View Full-Text
Keywords: lizards; genotypic sex determination (GSD); sex-chromosome evolution lizards; genotypic sex determination (GSD); sex-chromosome evolution
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Alam, S.M.I.; Sarre, S.D.; Gleeson, D.; Georges, A.; Ezaz, T. Did Lizards Follow Unique Pathways in Sex Chromosome Evolution? Genes 2018, 9, 239.

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