title: Fertilization of green frog (Rana clamitans) eggs in their native jelly by bullfrog (Rana catesbeiana) sperm.
abstract: Fertilization of R. clamitans eggs in their native jelly occurred when inseminated with high concentrations of R. catesbeiana sperm. Contrary to previous evidence, the block to cross-fertilization of the R. clamitans egg is not complete. This raises the possibility that R. clamitans x R. catesbeiana hybrids may form in nature.
mesh_terms: D000818:Animals; D001001:Anura; D005260:Female; D005306:Fertilization; D006824:Hybridization, Genetic; D008297:Male; D010063:Ovum; D011892:Rana catesbeiana / Q000502:physiology*; D011898:Ranidae / Q000502:physiology*; D013094:Spermatozoa / Q000166:cytology