Write a Short Note on Fertilization of Frog
Short Note on Fertilization of Frog
Structure of Eggs:
- i) Eggs are produced in ovaries present in abdomen.
- ii) Each egg is like a small ball spherical structure having a. One half pigmented part called animal hemisphere.
- One yellowish part due to storage of food or yolk called vegetal hemisphere.
iii) The middle of these two halves is called equator.
- iv) Animal hemisphere contain nucleus of the egg cell.
- v) After the sperm enters the egg, small grayish crescent shaped area called grey crescent is formed on one side of the animal hemisphere close to the equator.
External Fertilization:
- i) Male sex cells or sperms are produced in a pair of testes during breeding season.
- ii) Female release egg and male release sperm in water where fertilization takes place
iii) This result in formation of zygote. This is called external fertilization.
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