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REPRODUCTION IN ANIMALS

REPRODUCTION IN ANIMALS

What is reproduction in animals? Sexual reproduction involves the fusion of gametes. In animals two individuals are involved, a male and a female. Special organs known as gonads produce gametes.

In males testes produce sperms while in females ovaries produce ova. The fusion of male gamete and female gamete to form a zygote is called fertilization.

There are two types of fertilization.

 

External and internal Fertilization.

External fertillzation

  • Example in amphibians takes place in water.
  • The male mounts the female and shed sperms on the eggs as they are laid.
  • Eggs are covered by slippery jelly-like substance which provides protection.
  • Many eggs are released to increase the chances of survival.

Internal fertilization

  • This occurs in reptiles, birds and mammals.
  • Fertilization occurs within the body of the female.
  • Fewer eggs are produced because there are higher chances of fertilization since sperms are released into the female body.

 

See also:

METHODS OF FRUIT AND SEED DISPERSAL

POLLINATION

SEXUAL REPRODUCTION IN PLANTS

ASEXUAL REPRODUCTION

REPRODUCTION IN PLANTS AND ANIMALS

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