"BASIC PHASES OF PHYSIOLOGY OF REPLICATION! !

* BASIC PHASES OF PHYSIOLOGY OF REPRODUCTION!!

Sexual dimorphism in human male and female :


1. Gametogenesis.-

 It involves the formation of baploid sex cellis or gametes, called sperms and ova, from diploid primary germ cells, called gametogonia, present in the reproductive organs called gonads (testes in malle and ovaries in female).

Gametogenesis is of two typeand. 

(a) Spermatogenesis.--

 Formation of haploid sperms tvom diploid spermatogonia of the testes of male organism.

(b) Oogenesis. --

Formation of halploid ova from diploid cogonia of the ovaries of female organism.

2. Insemination (Ejaculation). --

It involves release of seminal fluid of male in the vagina of female at the end of copulatory act.

3. Fertilization. --

It involves the fusion of haploid male and female gametes to form diploid zygote. The fusion of gametic nuclei is called karyogamy while mixing of two sets of chromosomes of two gametes is called amphimixis.

4. Cleavage.--

 It includes the rapid mitotic division of zygote to form a single-layered hollow spherical larva called blastula (called blastocyst in mammals) so is allso called blastulation.

5. Implantation.--

 It is the process of attachment of blastocyst on the endometrium of the uterus.

6. Placentation.-- 

It involves the formation of an intimate mechanical and physiological connection, called placenta, between the foetal ane maternel tissues for the nutrition, respiration, excretion, etc., of the foetus.

7. Gastrulation. --

It is the process by which blastocyst is changed into gastrula larva with three primary germ Lagers.

8. Organogenesis.--

It includes the formation of specific organ systems from three primary germ layers of Gastrulation during the gestation period (period of pregnancy and embryonic development). It involves morphogenesis and differentiation.

9. Paturition.--

Baby from the mother's uterus after the gestation period (of about 280 days in human female).

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(Note)"--๐Ÿ‘‡๐Ÿป๐Ÿ‘‡๐Ÿป

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