Reflection about human fertilization
Answers
Note on human fertilization :
The fertilization is the phenomenon where the gamete of male and gamete of female comes in contact and fuses together.
The gamete of male is sperm and the gamete of female is the ovum or the egg.
During the cross, millions of sperms are released into the female's vagina. Among those, only one sperm that comes in contact with the egg first gets fused with the egg. This is called fertilization.
This fertilization results in the formation of zygote. Later on, the zygote gets transformed into an embryo and then to foetus and finally to a fully developed baby.
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The genetic content present in both gametes remains separated in the male and female pronucleus.
Explanation:
The different stages of fertilization are:
1) Preparation of sperm.
2) Recognition and binding of egg and sperm.
3) The fusion of sperm and egg.
4) Sperm and egg fused to give pronuclei and activation of the zygote.
- The oocyte contains the sum of two identities responsible for creating a new individual.
- The "genetic expression" and "cellular specialization" are successful and "twinning" is no longer possible (15 days after fertilization).
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