Fig. 4

Lampbrush chromosome sets from growing oocytes of diploid and triploid hybrid frog with RRL genotype. Lampbrush chromosome sets from oocytes of triploid hybrid frog with RRL genotype represented by 13 bivalents corresponding to chromosomes of P.ridibundus (a, b). Lampbrush chromosome sets from oocytes of diploid hybrid frog represented by 26 bivalents (c, d) and 26 univalents (e, f) with 13 bi- or univalents corresponding to P. ridibundus chromosomes and 13 bi- univalents corresponding to P. lessonae chromosomes. Lampbrush chromosomes are numbered alphabetically; italic type indicates correspondence of the identified chromosome to genotype of parental species: l – to P. lessonae, r – to P. ridibundus. Chromosomes were counterstained with DAPI (a, c, e). Corresponding phase-contrast micrographs are shown (b, d, f). Scale bars = 50 μm