Question

what is oogenesis?briefly explain the process of oogenesis in human female

Answer 1

aloha!

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★ what is oogenesis?

it is defined as the process by which ova or female gametes are formed.

★ the process in brief:

⋆ The diploid germ cells that have the potential to develop into ova are called oogonia. 
⋆ this occurs in the ovaries.
⋆ during oogenesis the oogonia increases in size.
⋆ it becomes diploid primary oocyte. { oocyte=> female germ cell capable of doing meiotic divisions in order to form ova }
⋆ when first meiotic division happens, two unequal haploid cells are formed. { smaller cell => first polar body and larger cell => secondary oocyte. }
⋆ The secondary oocyte undergoes second meiotic division.
⋆ giving rise to a polar body and ova.


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hope it helps :)

Answer 2

Answer for Class 12 Biology Students

Oogenesis:

 The process of formation of mature gamete is called oogenesis.

 Oogenesis is initiated during embryonic development stage when millions of gamete mother cells (oogonia) are formed within each fetal ovary. No more oogonia are formed after birth.

 Oogonia enter prophase- 1 of meiotic division and get temporarily arrested at that stage (till puberty) called primary oocytes.

 Each primary oocyte is surrounded by a layer of granulosa cells and then is called primary follicle.

 After puberty, under influence of gonadotropins, primary follicles further develop to form secondary and then tertiary follicles.

 Tertiary follicle is characterized by a fluid filled cavity called antrum.

 Tertiary follicle changes into a mature follicle or Graafian follicle.

 Each month the primary oocyte in the tertiary follicle completes first meiotic division.

 Asymmetrical cytokinesis results in formation of larger haploid secondary oocyte and tiny first polar body.

 Secondary oocyte retains bulk of nutrient rich cytoplasm of primary oocyte.

 Secondary oocyte proceeds to metaphase II and halts at this stage.

 Graafian follicle soon ruptures and releases secondary oocyte in the pelvic cavity. The process is called ovulation.

 Secondary oocyte completes meiosis II during fertilization. Asymmetrical cytokinesis results in formation of larger haploid ovum and tiny second polar body.

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