QUESTION : How does fertilization takes place in a frog? Why are its eggs coated with a jelly like substance?
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All frogs reproduce sexually, and all hatch from eggs. In almost all frogs, egg fertilization happens outside the female's body instead of inside. The female releases her eggs and the male releases his sperm at the same time
Frogs begin their lives as tadpoles that are hatched in the water from tiny jelly-covered eggs. The mother frog will lay thousands of eggs at one time. Imagine having thousands of brothers and sisters! The jelly has an awful taste, which protects the eggs from predators until they are ready to hatch.
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Sea urchin eggs have a "jelly" coat around them that serves them in many ways.
It prevents too many sperm from getting to the egg at the same time, because of its viscosity.
Proteins in the jelly initiate the acrosome reaction in sperm so they are ready to fertilize the egg.
It provides a sort of "shock absorber" to prevent injury to the egg from wave action.
It is colorless, so it is difficult to see.
Add a small amount of "sumi ink" to the sea water surrounding the eggs to make the jelly layer more visible.
The ink particles are too big to get through the jelly layer and are excluded.
Where the ink is excluded, more light can get through and we see the jelly layer as a clearing around the eggs
It prevents too many sperm from getting to the egg at the same time, because of its viscosity.
Proteins in the jelly initiate the acrosome reaction in sperm so they are ready to fertilize the egg.
It provides a sort of "shock absorber" to prevent injury to the egg from wave action.
It is colorless, so it is difficult to see.
Add a small amount of "sumi ink" to the sea water surrounding the eggs to make the jelly layer more visible.
The ink particles are too big to get through the jelly layer and are excluded.
Where the ink is excluded, more light can get through and we see the jelly layer as a clearing around the eggs
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