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• W4213054454 endingPage "1192" @default.
• W4213054454 startingPage "1179" @default.
• W4213054454 abstract "How innovations such as vision, flight and pregnancy evolve is a central question in evolutionary biology. Examination of transitional (intermediate) forms of these traits can help address this question, but these intermediate phenotypes are very rare in extant species. Here we explore the biology and evolution of transitional forms of pregnancy that are midway between the ancestral state of oviparity (egg-laying) and the derived state, viviparity (live birth). Transitional forms of pregnancy occur in only three vertebrates, all of which are lizard species that also display intraspecific variation in reproductive phenotype. In these lizards (Lerista bougainvillii, Saiphos equalis, and Zootoca vivipara), geographic variation of three reproductive forms occurs within a single species: oviparity, viviparity, and a transitional form of pregnancy. This phenomenon offers the valuable prospect of watching 'evolution in action'. In these species, it is possible to conduct comparative research using different reproductive forms that are not confounded by speciation, and are of relatively recent origin. We identify major proximate and ultimate questions that can be addressed in these species, and the genetic and genomic tools that can help us understand how transitional forms of pregnancy are produced, despite predicted fitness costs. We argue that these taxa represent an excellent prospect for understanding the major evolutionary shift between egg-laying and live birth, which is a fundamental innovation in the history of animals." @default.
• W4213054454 created "2022-02-24" @default.
• W4213054454 creator A5008983231 @default.
• W4213054454 creator A5016063759 @default.
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• W4213054454 creator A5040485140 @default.
• W4213054454 creator A5052132995 @default.
• W4213054454 creator A5058497264 @default.
• W4213054454 creator A5080182198 @default.
• W4213054454 date "2022-01-30" @default.
• W4213054454 modified "2023-10-10" @default.
• W4213054454 title "Understanding the evolution of viviparity using intraspecific variation in reproductive mode and transitional forms of pregnancy" @default.
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