Introduction to fertilization, Biology

INTRODUCTION -

  • Fertilization is a complex process which involves fusion of male & female gametes.
  • The male gamete in animals is called as sperm & the female gamete as ovum.
  • Albert Tiler - Fertilization is a sequence of various events initiate through sperm.
  • Austin - The fusion of male & female gametes to form zygote is called as fertilization.
  • O. Hertwig - Fusion of male & female pronuclei is called as fertilization.
  • Syngamy - Fusion of gametes in the fertilization is called as syngamy.
  • Plasmagamy - Fusion of the cytoplasm of gametes.
  • Karyogamy - Fusion of nucleoplasm.
  • On the basis of shape & size gametes are two types -

                    1. Isogamy - In this male & female gametes are similar.

                    2. Anisogamy - The male & female gametes are different.

  • Genetically contribution of male & female gametes is equal.
  • According James Grey fertilization essential for -

1. Activation -

In this process cortex of egg activated & formed the fertilizine membrane over P.M.

Cytoplasm of ova initiate different metabolic activities, this activities essential for initiate cleavage.

2. Amphimixis -

In this process male & female pronuclei are fused and formed the diploid structure, i.e. zygote.

Genetic variation stimulate in the species.

Posted Date: 10/3/2012 8:19:40 AM | Location : United States







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