Are there asexual frogs

The female lays eggs and the male externally fertilizes the eggs but squirting sperm in the water. Frogs develop differently, in that they have a tadpole stage and them metamorphose into a frog. A turtle lays eggs, but like a bird and probably a dinosaur, fertilization occurs internally. Dinosaurs are extinct, but because we have found dinosaur eggs, we believe that they reproduced much like chickens.

The male internally fertilized the female, and then the female laid her eggs. The discussion after the grouping should be centered on how the organisms reproduce, and what characteristics seem to be more common in the sexual versus asexual modes of reproduction.

They are to divide the pictures into two groups, those that they predict would reproduce sexually and those that the believe reproduce asexually. Life Cycle - Organisms 5B Lab. Exploring why large organisms reproduce sexually. Students sort sexual and asexual reproduction.

Binary fission. Several states are considering banning atrazine, and six class action lawsuits have been filed seeking to eliminate its use. The European Union already bars the use of atrazine.

Working with the African clawed frog, Hayes and his colleagues showed in that tadpoles raised in atrazine-contaminated water become hermaphrodites — they develop both female ovaries and male testes gonads.

This occurred at atrazine levels as low as 0. Subsequent studies showed that native leopard frogs Rana pipiens collected from atrazine-contaminated streams in the Midwest, including from areas up to 1, miles from where atrazine is applied, often had eggs in their testes. And many males had lower testosterone levels than normal females and smaller than normal voice boxes, presumably limiting their ability to call mates.

Those early studies were hampered by the inability to easily distinguish genetically male from genetically female frogs.

And that led us to conclude we have discovered a unique population that has the same ancestors as those frogs which have spread from its source on the Odra River north to the Baltic Sea. But because they had no females, nature found another way to breed: Hybridogenesis — a kind of sexual parasitism. This occurs through a process by which sexual gametes are captured, converted to clones, and returned to sexual populations in one generation.

As such, hybridogenesis is an extraordinary mode of reproduction, comprising components from both asexual and sexual reproduction. When the mating season comes, it infiltrates the male Marsh Frog population. They start calling and luring their females. And when the females are ready to mate, the Green Jumper jumps on the female and simply fertilizes her.

Generally, this mode of reproduction is found in hybrids arising from historical or ongoing hybridization events. But how is it possible that in the case of the Green Jumper, only males are born?