Gamete types, sex determination and stable equilibria of all-hybrid populations of diploid and triploid edible frogs (Pelophylax esculentus) |
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Authors: | Ditte G Christiansen |
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Institution: | (1) Ecology, Zoological Institute, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland |
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Abstract: | Background Triploid individuals often play a key role in speciation by hybridization. An understanding of the gamete types (ploidy and
genomic content) and stability of hybrid populations with triploid individuals is therefore of importance for exploring the
role of hybridization in evolution. The all-hybrid populations of the edible frog, Pelophylax esculentus, are unique in their composition and genetic dynamics: Diploid (genotype LR) and triploid (LLR and LRR) hybrids depend on
each other's different gamete contributions for successful reproduction and maintenance of the populations, as the parental
genotypes P. lessonae (LL) and P. ridibundus (RR) are absent among adults. This study provides data and interpretations on gamete types and sex determination that are
essential for understanding the function, evolutionary potential and threats of this intriguing system. |
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