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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Mutual maintenance of di- and triploid Pelophylax esculentus hybrids in R-E systems: results from artificial crossings experiments

Fig. 1

Results of crossing experiments of triploid hybrid females with RRL or LLR genotypes with P. ridibundus and di- or triploid hybrid males. Tadpoles resulting from crosses were represented by P. ridibundus (RR) and P. esculentus (RL) individuals. Triploid hybrid females with RRL genotype produced oocytes with 13 bivalents corresponding to P. ridibundus chromosomes (orange). All observed oocytes of triploid hybrid female with LLR genotype included 13 bivalents corresponding to P. lessonae chromosomes (blue). Obtained results allow to assume that triploid hybrid females with RRL genotypes produce gametes with P. ridibundus genome (R), triploid hybrid females with LLR genotype produce gametes with P. ridibundus (R) and P. lessonae (L) genomes. Question marks (?) indicate discrepancy between oocyte chromosomal sets and gametes genome composition inferred from crossing experiments. Diploid hybrid males presumably produce haploid sperm with P. ridibundus (R) and P. lessonae (L) genomes and finally triploid hybrid males produce haploid sperm with P. ridibundus genome (R). Crossing numbers correspond to Additional file 1: Table S1

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